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StarAm Plan V2.2b Quick Manual Copyright © 1999 by Thorsten Passow This quick manual describes the most important things you need to know, if you want to work with StarAm Plan. There are many features, which make the work with StarAm Plan easier but are not mentioned in this quick manual. Some of them works like in other spreadsheet programs, so try if you know features of other spreadsheets. StarAm Plan support almost complete AmigaOS 3.0. These features are not mentioned in this quick manual, so try if StarAm Plan support them. There are other important informations in the file ReadMeFirst! which you MUST read. IF YOU DO NOT READ ReadMeFirst! YOU MUST NOT USE StarAm Plan! All informations in ReadMeFirst! aren't repeated in this quick manual. 1. How to install? Unpack the archive and read ReadMeFirst!. If you haven't installed reqtools.library version 38, you must copy it to libs:. There is no need to copy any other file to elsewhere. To activate the english catalog, read ReadMeFirst!. 2. How to start? Doubleclick on the icon StarAm Plan. 3. What is a worksheet? The main documents in StarAm Plan are worksheets. After you've started StarAm Plan. you will see a worksheet on the screen. A worksheet is an array of cells. The cells are named by its row and its column in the array. The columns are counted by letters from A to ZZZ. The rows are counted from 1 to 32766. The letters and numbers are shown above/left of the worksheet in the same window. All texts, values and formulars are in the diverse cells of the worksheet. All you input in the cells is shown calculated and formatted in the worksheet. That what you've entered in the cell is shown above the worksheet in the same window in the line »Cont.:«. 3. How to input? The sizes of the worksheets are different. The active cell, which is shown highlightet, can only be inside the boundaries of the worksheet. If you are in the last row of the worksheet and you press RETURN, the worksheet will become one row larger. If you are in the last column of the worksheet and press TAB, the worksheet will become one column larger. A new (empty) worksheet contains only the cell A1, so you must first make the worksheet larger. You can also use the cursor keys to enlarge the worksheet if you've activated this option. If you press a character key or the »Esc« key, the contents of the current cell is deleted and the character or »Esc« (a rectangle is shown for this "character") is the new contents of the cell. You are now in input mode, so you can enter further characters in this cell. You can see, what you enter, in the string gadget »Cont.:«, which changes its name to »Input:« if you are in input mode. To change into input mode, you can also click in the string gadget »Cont.:«. To leave input mode press RETURN, if the string gadget is active. If you want to undo the input BEFORE you've left input mode, you must delete the contents of the string gadget and then press RETURN. You can deactivate this option, so that the cell contents is deleted instead. But then you must use the mouse to cancel the input. There are five types of things, you can enter into a cell: a. Texts: Everything, which is not one of the other four things is a text. b. Decimal numbers: 12.65 (normal decimal number) 3.647E-23 (decimal number in scientific notation) maximum decimals: 16 maximum exponent: ±308 c. Dates: to input 23-Nov-1996 you must type: 23/11/1996 23/11/96 means 23-Nov-0096 !!!! d. Time: 13:23:56 (hours:minutes:seconds), max. hour 23, min. hour 0 e. Formulars: The other four types are constants and aren't calculated. This type will produce a cell type (this is not the same as these types!) of decimal number like type b or a text like type a, if the cell is empty. You can change the cell type later. A formular must start with an »Esc« (see above) for decimal numbers and with »""+« (without » and «) for texts. 4. Cell type and cell format If you want first to select the format of a cell and then enter something, you must set the correct cell type with the »Format/Type« commands, before you set the format. Hint: Use multiselection of menuitems! The value of a cell of type date means the days since 1-Jan-1978, e.g. -1 is 31-Dec-1977, 0 is 1-Jan-1978, 1 ist 2-Jan-1978. To see this, enter 1 in a cell and select »Format/Types/Date« from the pulldown menus and enter 1/1/1978 in a cell and select »Format/Types/Value«. The value of a cell of type time means the seconds since midnight. The value 1 of a cell of type month means january, 12 means december. The value 1 of a cell of type weekday means monday, 7 means sunday. 5. Syntax of formulars A formula to calculate a value must begin with the sign Esc (the Esc key), which is shown as rectangle. You can use expressions with functions (build in and user defined), + (addition), - (subtraction), * (multiplication), / (division), ^ (power), =, <, >, <=, >=, <> (boolean comparisons, 0 if false, 1 if true), ( and ). The Esc may only be the first character of a formula. The arguments can be: - cells and ranges: cells: e.g. B12 ranges of cells: e.g. B12-C23, B12 is the top/left and C23 the bottom/right cell of the range. The top/left cell MUST be the first! If »Relocate« is set in the window Edit-Settings (to open in the icon bar), StarAm Plan interprete this as relative to the cell this formula is in if the cell is copied, e.g. the formula is in cell C12, then B12 means the cell one column left. If you set a ! behind the column and/or row, then it is interpreted as absolute: B!12! means B12, B12! means the cell in row 12 one column left, B!12 means the cell in column B in the same row. If »Ignore !« is selected in the window Edit-Settings, then also B!12!, B12!, B!12 are relative. If »Relocate« is NOT set, then B12 is absolute, too. Be carefull if you make something like this: B!12!-C23. This could produce a wrong range, if you move the cell with this formula. Cells and ranges of another layer of a 3dim. worksheet (another worksheet of the project) can be accessed by XX: in front of the cell/range, XX is the layer: AA, AB, ..., ZZ. 3dim. ranges are possible, e.g. AC:B12-AE:C23. There mustn't be a ! behind the the layer, e.g. AC!:B12 is not possible. This references are linked to its cells, e.g. in a formular is the refrence B12 and a new row is inserted after row 3 then the reference in the formular is changed to B13. - names for cells and ranges: &name. The names must begin with a & and are case sensitive. &Blatt is always defined as the complete worksheet. Access to names of another layer is possible, e.g. AC:&name. - variables: variables can contain a value, must begin with %, e.g. %variable, and are case sensitive. %Pi is always defined as 3.14..., %Falsch is always defined as 0 and %Wahr is always defined as 1. - build in functions: see below. - user defined functions: @function. The functions must begin with a @ and are case sensitive. If you enter a calculable expression in the string gadget »Formul.« of the window Define Functions, then the function results a value. If you enter a text-formula then the function results a text. The arguments of a user defined function can be values or texts (as constant or formula). In the string gadget »Arguments« of the window Define Functions, there must be a % for each value argument and a $ for each text argument in the correct order and without a seperator. In the entered formular (string gadget »Formul.«) the arguments are §1, §2, §3, ... §14 (the number is the number of the argument). You could place them where you could place variables. Ranges as arguments are not possible. - links to cells and ranges of other worksheets: A link begin with \ and end with . (a point). Between both characters must the name of the worksheet without the suffix .sab. Only links to worksheets with the suffix .sab are possible. Examples: \worksheet.B4, \worksheet.B12-C23, \worksheet.&name If operators, brackets or # is in the name of worksheet (e.g. the - in XY-Test.sab) then the name must be put between " (e.g. \"XY-Test".B4, etc.) If you specify a path, the name must put between ", too (e.g. \"Dateien/worksheet".B4, etc). Formulars to create Texts must start with a Text-Constant, e.g. ""+, the + adds a text to an other text, e.g. "Hello"+" I" is "Hello I". You can use text-functions (they start with $), text-variables (they start with $ and are case sensitive), cells (inclusive links to other worksheets), names (inclusive links to other worksheets), text-constants (enclosed by ") and user defined functions in text formulars. 6. Mark ranges of cells Many commands of StarAm Plan work on cells. You must mark the cells a command shall work on. You can select a cell by clicking on it with the left mouse button (or using the cursor keys, see next section). You can mark a range by moving the mouse pointer over the upper left cell of the range, press the left mouse button and move (with pressed left mouse button) the mouse pointer to the lower right cell of the range. If the shift key is pressed while you mark a range then the range will be marked additionally (multiselection of ranges). If you click on R\C then the whole worksheet will be marked as range, if you click on the names of columns (A, B, ...) or rows (1, 2, 3, ...) then the column or row will be marked as range. 7. Commands which are not in the pulldown menus You can change the width of a column by pressing the left mouse button over the right frame of the name (A, B, C, ...) of the column and move the mouse pointer (with pressed left mouse button) to the new width. With a double click on the right frame StarAm Plan choose the best width (this is one character more than the maximum length of a cell contents in this column). If you press the left amiga key while you mark a range then the mouse pointer changes. With the right mouse button you can abort now. If you click on a cell now then the marked range will be moved to the new position. If you press the left amiga key while you click on the cell then the marked range will be copied. If you press an alt key while you mark a range then the command »Edit/Duplicate/right« (only cells in one row were marked) or ».../left« (only cells in one column were marked) will be executed. An arithm. series with increment 1 will be created, if you press Ctrl instead of Alt. Keyboard commands of the editor: Cursor up - the cell cursor moves one cell up Cursor down - the cell cursor moves one cell down Cursor right - the cell cursor moves one cell right Cursor left - the cell cursor moves one cell left. ... with Ctrl - the cell cursor moves in the first/last row/column ... with Alt - ... into the first/last row/column on the screen or one page in arrow direction mark range - if the left shift key is pressed, then the range will be increased or decreased left and top with the keys described above. With the right shift key pressed it happens the same right and bottom. Help - call the online help Backspace - moves the cell cursor one cell left. Return - moves the cell cursor to the beginning of the next row. If the cell cursor is in the last row, then the worksheet will become one row larger. Tab - moves the cell cursor one cell right. If the cell cursor is in the last column, the worksheet will become one column larger. Ctrl-e - the input mode is activated. Ctrl-g - the cell (range) string gadget is activated (go to command) Ctrl-r - the current worksheet window is refreshed CTRL-= - the current worksheet (no range marked)/current range is recalculated Del - the contents and format of the current cell is deleted Ctrl-Shift-m - marks the whole worksheet as range Ctrl-% - changes cell type of current cell to percent Ctrl-. - changes cell type of current cell to date Ctrl-: - changes cell type of current cell to time Gadgets in the icon bar (sorted up to down): - open worksheet manager - open chart manager - open variables manager - open names-manager - open function-manager (only user defined functions!) - open format manager - open tab. format manager - open character window - open edit settings window - Worksheet/New - Worksheet/Open - Worksheet/Save - recalculates the current range or current worksheet (no range marked) - Worksheet/Print as - Edit/Cut/Clear - Edit/Copy - Edit/Insert/Overwrite - centers the contents of the current cell in the whole row. Other cells in the row are overwritten. 8. Pulldown Menus The worksheet windows, the graphic windows and the chart manager have (different) pulldown menus. I think they are self explained. 9. Create charts Not all chart types are available in the menu Graphic. You must use the chart manager if you want to use the full capability. StarAm Plan has 8 chart types with several subtypes. You can select the types with the cycle gadget. The subtypes must be selected in the windows Chart Attributes (checkbox gadget »3D Eff.«) and Special. Step, line, point and xy charts are subtypes of the type curve. For a histogram you must set a x-range in the window System of Coordinates. If you want to create a xy chart then the values in the cells of the row in the integer gadget »Row« in the window Chart Attributes (»Rows« is NOT checked) or the column in the string gadget »Column« (»Rows« is checked) must be in ascending order. If »No xy« (in window Special) is NOT checked and the condition is fulfilled then EVERY curve chart becomes a "false" xy chart. If you want a "true" xy chart then »Pairs« must be checked. Each datapoint must be a pair of two (if you want errorbars up to six) values (cells). In this case the condition is ignored. Creating charts is very complex. I haven't described all you need to know if you want to use the full capability. I strongly recommend to look at the examples and to play with the settings. 10. Using mathematical expressions in the texts of worksheets and charts You can use fractions, subscript, superscript, symbols, greek letters and the styles italic and bold in the texts of a worksheet (including text-formulars) or chart. The commands are LaTeX like to make the learning easier. A command begins with \ (or is a single character: _ ^ { }) and ends with the first non letter character. If it is a space then it is not printed. You must then enter two spaces. All other non-letter characters are printed (or interpreted if it is a \ _ ^ { }). Unknown commands are ignored. The commands are: Fractions: \frac{numerator}{denominator} You mustn't use the command \frac in the command \frac. All other commands are allowed. Sub- and superscript: _ _{text} ^ ^{text} With _ resp. ^ only the first following character will be sub- resp. superscript. You mustn't use \frac in a sup/sub text. For the following _ and ^ are the same, so I only use _. Allowed: _{text_{text}text} \frac{text_{text}text}{text} Not Allowed : _{text_{text_{text}text}text} \frac{text_{text_{text}text}text}{text} Styles: \it \sl \bf \rm \it and \sl are the same (may change in future) and produce italic. \bf produce bold. \rm reset to normal. Special Characters: \backslash \_ \^ \{ \} These characters have a special meaning, so if you want to print them you must use these commands. Mathematical symbols and greek letters: You need your own symbol font to use these commands, because I do not know a PD symbol font. Because the different symbol fonts have other symbols and the same symbols on other places, these commands are defined in the file »MathCharDef«. Each line in this file may have up to 255 characters. Lines beginning with a ; are comments. I think all other is self explained, if you look in »MathCharDef«. You can use more then one symbol font. Put the name of the second symbol font after the definitions with the first and do then the definitions with the second symbol font and so on. A. Build in functions If a function have more then one argument, then you must separate the arguments by the character #. VAR, VAR1 and VAR2 represent cells or ranges. CELL, CELL1, CELL2, CEL1, CEL2, CEL3 must be a cell or variable, RANGE, RAN1, RAN2 must be a range. EXPRESSION, EXPR1, EXPR2, EXP1, EXP2 can be every calculable expression. BOOL can be every boolean expression (Value: 0 or 1, e.g. comparisons, boolean functions). TEXT, TXT1, TXT2 can be every text formula. See also subitmens of menu Calculate. I hope the following is translated correct. ABS(EXPRESSION) : Make EXPRESSION positive ACH(EXPRESSION) : Area cosinus of EXPRESSION ACS(EXPRESSION) : Arcuscosinus of EXPRESSION in radiant AGL(CELL#VAR#...) : Number of arguments equal to CELL AGR(CELL#VAR#...) : Number of arguments larger than CELL AKL(CELL#VAR#...) : Number of arguments smaller than CELL ANL(VAR1#VAR2#...) : Number of not empty + not text cells ANN(VAR1#VAR2#...) : Number of arguments unequal zero ANN(CEL1#CEL2#CEL3): Calculates amount of annuity(payment,future Value,rate of interest) ANW(CELL#VAR#...) : Calculates net value of VAR with rate of interest CELL AQV(BOOL1#BOOL2) : boolean aquivalence of BOOL1, BOOL2 ASA(RAN1#RAN2) : Extern deviation of values in RAN1 with errors in RAN2 ASC(TEXT) : Results ASCII-Code of first character of TEXT ASH(EXPRESSION) : Area sinus of EXPRESSION ASN(EXPRESSION) : Arcussinus of EXPRESSION in radiant ATH(EXPRESSION) : Area tangens of EXPRESSION ATN(EXPRESSION) : Arcustangens of EXPRESSION in radiant AWT(CEL1#CEL2#CEL3): Calc. actual value (instalment,rate of interest, periods) BWT(CEL1#CEL2#CEL3): Calc cash value (principal,rate of interest,periods) COS(EXPRESSION) : Cosinus of EXPRESSION, EXPRESSION in radiant CSH(EXPRESSION) : Cosinus hyperbolicus of EXPRESSION DAD(VAR1#VAR2#...) : DAM(VAR1#VAR2#...) : DAT(EXP1#EXP2#EXP3): Date from year,month,day DON(VAR1#VAR2#...) : Average without zero DST(VAR1#VAR2#...) : Average $DTT(EXPR1#EXPR2) $DTT(EXPR1) : Date from value EXPR1 in format EXPR2 $EFG(TXT1#EXP#TXT2): Insert TXT2 at EXP in TXT1 ERG(TXT1#TXT2) : Cell get prefix TXT1 and suffix TXT2 $ERS(TXT1#EXP1#EXP2#TXT2) Replace from EXP1 EXP2 char. in TXT1 by TXT2 EWT(CEL1#CEL2#CEL3): Calc. final value (principal,rate of interest,periods) EXP(EXPRESSION) : e^EXPRESSION FAK(EXPRESSION) : Faculty of EXPRESSION FLR(TEXT) : Output error text TEXT in cell $FLR(TEXT) : Output error text TEXT in cell FMT(EXP1#EXP2#EXP3#TXT1#TXT2): Cell get format EXP1, with FMT(EXP1#EXP2#EXP3) decimals EXP2 in colour EXP3 and prefix FMT(EXP1#EXP2) TXT1 and suffix TXT2 FMT(EXP1) $FMT(EXP1) : Cell get format EXP1 FND(TXT1#EXP#TXT2) : Position of TXT2 in TXT1 from EXP FNG(TXT1#EXP#TXT2) : Like FND(), not case sensitive FRB(EXPRESSION) : Cell get colour EXPRESSION $FRB(EXPRESSION) : Cell get colour EXPRESSION FST(EXPR1#EXPR2) : Truncate EXPR1, EXPR2 decimals FST(EXPRESSION) : Truncate all decimals of EXPRESSION GAZ(EXPRESSION) : Results the largest integer <= EXPRESSION GDA(CEL1#CEL2#CEL3): Calc. degr. Depreciation(costs,rate,periods) GMT(RAN1#RAN2) : weighted average of values in RAN1 with errors in RAN2 $GRS(TEXT) : Make TEXT uppercase GWT(CELL1#CELL2) : G=P*100/p; CELL1=P; CELL2=p GZR(EXPRESSION) : degrees to radiant HTE() : todays date HWT(VAR1#VAR2#...) : Maximum value of the arguments IDT(TXT1#TXT2) : Compares TXT1 with TXT2, TRUE or FALSE IDX(RAN#EXP1#EXP2) : Value of cell with coordinates EXP1,EXP2 in RAN $IDX(RAN#EXP1#EXP2): Text of cell with coordinates EXP1,EXP2 in RAN ILR(CELL) : 1 if cell (not variable!) CELL empty, else 0 INV(CELL) : 1 if cell (not variable!) CELL »NA!«, else 0 ISA(RANGE) : Internal deviation with error in RANGE JAR(EXPRESSION) : Year from Date EXPRESSION JTR(CEL1#CEL2#CEL3): Calc. annual discharge rate(credit,rate of interest,currency) $KLN(TEXT) : Make TEXT lowercase $KPS(TXT1#EXP#TXT2): Copy TXT2 to position EXP in TXT1 LFZ(CEL1#CEL2#CEL3): Calc. currency(act. value,future value,rate of interest) LGB(EXPR1#EXPR2) : Logarithm of EXPR2 with base EXPR1 LGN(EXPRESSION) : Logarithmus naturales (log e EXPRESSION) LIA(CEL1#CEL2#CEL3): Calc. lin. depreciation(costs,rate,periods) LNG(TEXT) : Length of TEXT $LNK(TXT#EXP) : Results the first EXP characters of TXT LOG(EXPRESSION) : Decadic Logarithm (log 10 EXPRESSION) $LSN(TXT#EXP1#EXP2): Deletes from EXP1 EXP2 characters in TXT MED(VAR1#VAR2#...) : Median of arguments MIN(EXPRESSION) : Minute from time EXPRESSION MIT(VAR1#VAR2#...) : Average of maximum and minimum of arguments MON(EXPRESSION) : Month from date EXPRESSION NIT(BOOL) : Boolean complement of BOOL NUN() : Now (a time) NVB() : »NA!« ODR(BOOL1#BOOL2) : Boolean or of BOOL1, BOOL2 PKT(VAR1#VAR2#...) : Product of arguments PSZ(CELL1#CELL2) : p=P*100/G; CELL1=P; CELL2=G PWT(CELL1#CELL2) : P=G*p/100; CELL1=G; CELL2=p QSM(EXPRESSION) : Calc. cross sum of EXPRESSION QWZ(EXPRESSION) : squareroot of EXPRESSION $RCT(TXT#EXP) : Results the last EXP characters of TXT RGZ(EXPR1#EXPR2) : Rounds EXPR1 to EXPR2 decimals RGZ(EXPRESSION) : Rounds EXPRESSION RNG(CELL#VAR#...) : Rang of cell in arguments RST(EXPR1#EXPR2) : Modulo RZG(EXPRESSION) : Radiant to degrees SEK(EXPRESSION) : Seconds from time EXPRESSION SGL(CELL#VAR#...) : Number of the first argument equal to CELL SGR(CELL#VAR#...) : Number of the first argument larger than CELL SIN(EXPRESSION) : Sinus of EXPRESSION, EXPRESSION in radiant SKL(CELL#VAR#...) : Number of the first argument smaller than CELL SLN(VAR) : Set decimals in cell format SNH(EXPRESSION) : Sinus hyperbolicus of EXPRESSION STA(VAR1#VAR2#...) : Standard deviation with n-1 STD(EXPRESSION) : Hour of time EXPRESSION STL(EXPRESSION) : Cell get style EXPRESSION $STL(EXPRESSION) : Cell get style EXPRESSION STN(VAR1#VAR2#...) : Standard deviation with n SUM(VAR1#VAR2#...) : Sum of arguments. SVS(EXP1#RAN#EXP2) : Value of cell EXP2 on the right of EXP1 in RAN $SVS(EXP1#RAN#EXP2): Text ofr cell EXP2 on the right of EXP1 in RAN TAG(EXPRESSION) : Day of date EXPRESSION TAN(EXPRESSION) : Tangens of EXPRESSION, EXPRESSION in radiant $TIL(TXT#EXP1#EXP2): Results from EXP1 EXP2 characters in TXT TNH(EXPRESSION) : Tangens hyperbolicus of EXPRESSION TWT(VAR1#VAR2#...) : Minimum value of the arguments TZZ(TEXT#EXPR) TZZ(TEXT) : Number from TEXT in base EXPR UND(BOOL1#BOOL2) : Boolean and of BOOL1, BOOL2 UZT(EXP1#EXP2#EXP3): Time (hour,minute,second) VAR(VAR1#VAR2#...) : Varianz of arguments with n-1 VRN(VAR1#VAR2#...) : Varianz of arguments with n VWS(EXP#RAN1#RAN2) : Value of cell at position EXP in RAN1 in RAN2 $VWS(EXP#RAN1#RAN2): Text of cell at position EXP in RAN1 in RAN2 VZN(EXPRESSION) : Results sign of EXPRESSION as -1,0,1 WAL(CELL#VAR#...) : Value of the argument with the number in CELL $WDH(TXT#EXP) : EXP times TXT WNN(BOOL#EXPR1#EXPR2): If BOOL true then EXPR1 else EXPR2 $WNN(BOOL#TXT1#TXT2): if BOOL true, then TXT1 else TXT2 WTG(EXPRESSION) : Weekday from date EXPRESSION XOR(BOOL1#BOOL2) : Boolean exclusive or of BOOL1, BOOL2 $ZCN(EXPRESSION) : Results character with ASCII-Code EXPRESSION ZFB(EXPRESSION) : Results Randomnumber between 0 and EXPRESSION ZFL() : Results Randomnumber between 0 and 1 ZSS(CEL1#CEL2#CEL3): Calc. rate of interest(future value,actual value,periods) $ZTT(EXPR1#EXPR2) $ZTT(EXPR1) : Time from value EXPR1 in format EXPR2 ZVS(EXP1#RAN#EXP2) : Value of the cell EXP2 below EXP1 in RAN $ZVS(EXP1#RAN#EXP2): Text of the cell EXP2 below EXP1 in RAN ZWN(%/$#EXPRESSION): Variable %/$ get value EXPRESSION $ZWN(%/$#TEXT) : Variable %/$ get text TEXT ZWT(CEL1#CEL2#CEL3): Calc. Future Value(instalment,rate of interest,periods) $ZZT(EXP1#EXP2#EXP3) $ZZT(EXP1#EXP2) : Make text (Number,decimals,base) B. Important Hints Most Requesters are asynchrone. The gadget between »OK« and »Cancel« do the same as »OK«, but do not close the requester. The action works on the current worksheet, not on the worksheet which was current when you've opened the requester. The range in the gadget »range« is used, not the range selected in the worksheet. Everything you do in »managers« have immediatly effects in the working of StarAm Plan. There is no possibility to cancel. Managers are not requesters! The function manager only contains user defined functions! The build in functions are in the menu »Calculate«. If you use password protection of cells, you should note, that the passwords and the protected cells aren't saved encrypted. You must save the hole worksheet encrypted. You need XPK with cryptography librarys to encrypt a worksheet. The ranges of range names, which are linked with the cells, mustn't overlap. You mustn't load two or more projects which contain the same worksheet at the same time. The error "Ref. old!" means that it could be that the references in the formular aren't correct any more. If the references are correct then recalculate the worksheet. Cells are always calculated in the correct order. But a chain of cells, which are linked with references to uncalculated cells, may only contains 10 cells and using brackets in the cells can reduce this limit to only one cell in the chain (i.e. no linking!). StarAm Plan uses doubleprecision floating point numbers. This has two effects: 1. These numbers have left and right of the decimalpoint together 16 decimals. This means if a number is 1236682.134733647 and you select as cellformat round to 16 then, right the last number, 7 WRONG numbers occur. You mustn't select a rounding of more then 16 minus number of decimals left of the decimalpoint. 2. Calculating with floating point numbers isn't exact (a problem of ALL personal computers, not only of StarAm Plan!). After a simple addition the last decimal might be wrong. By many operations this can produce an absolutely wrong result. Perhaps, rounding of intermediate results might help. Usually there aren't any problems, nevertheless: DO NEVER TRUST BLINDLY A RESULT! The routine of linear (etc.) regression is only mathematically correct, if the errors of the x-values are much smaller than the errors of the y-values. You must set the errors of the y-values or in case of linear regression the errors must be equal or in case of exp. or pow. regression the relative errors must be equal to get correct results.