грапхиц солутионс FOR цомал 0.14 BY лOWELL тOMS рECENTLY, и RAN ACROSS A NEW HAND HELD CALCULATOR WHICH WAS ABLE TO PLOT FUNCTIONS ON A SLIGHTLY OVERSIZED лцд SCREEN. вELL, IT WAS PRETTY NEAT, BUT THE LAST THING и NEED IS ANOTHER CALCULATOR. вHILE A GRAPHING ROUTINE MAY BE A CHORE TO PROGRAM IN басиц, цомал IS A NATURAL FOR THE TASK. бEFORE YOU SKIP ON TO THE NEXT PROGRAM WHILE MUMBLING WHO NEEDS ANOTHER GRAPHING ROUTINE, YOU SHOULD KNOW THAT THIS ONE HAS SOME DIFFERENT CAPABILITIES. тHE ROUTINE CAN PLOT UP TO SIX EQUATIONS (Y=F(X)) ON THE SAME SCREEN. тHESE EQUATIONS ARE ENTERED AND DELETED WHILE THE PROGRAM IS RUNNING. тHE RANGE AND ORIGIN OF THE ь AND ы AXES ARE EASILY MODIFIED FROM WITHIN THE PROGRAM. фINALLY, A JOYSTICK CONTROLLED ROUTINE PRINTS THE COORDINATES OF ANY INTERESTING POINT TO THE SCREEN. тHIS ELIMINATES THE NEED FOR AN EXTENSIVE GRID, AND GIVES MUCH MORE ACCURATE RESULTS THAN THE EYEBALL APPROACH. хOPEFULLY, и'VE PIQUED YOUR CURIOSITY ENOUGH THAT YOU'RE READY TO LOAD THE PROGRAM. гRAPHIC'SOLUTIONS INCLUDES FOUR DIFFERENT PROCESSES. вHEN THE INITIAL MENU SCREEN APPEARS YOU MAY SELECT TO ENTER A FUNCTION, DEFINE THE AXES, PLOT A FUNCTION, OR FIND A POINT ON YOUR PLOT. сELECT 1 AND A NEW MENU APPEARS WHICH ALLOWS YOU TO ENTER A FUNCTION, VIEW PREVIOUSLY ENTERED FUNCTIONS, CLEAR ALL FUNCTIONS, OR RETURN TO THE MAIN MENU. сELECT 1 AGAIN AND YOU ARE ASKED IN WHICH POSITION (1-6) YOU WANT TO PLACE YOUR FUNCTION. иF YOU HIT <ретурн>, THE FUNCTION IS AUTOMATICALLY PLACED IN THE FIRST OPEN POSITION, (ENTER ANOTHER NUMBER TO OVERWRITE A PREVIOUS ENTRY). нOW, YOU ARE ASKED TO ENTER YOUR FUNCTION: ы=ь^4+5*ь^3-7*ь^2-29*ь+30 тHE COMPUTER PAUSES FOR A MOMENT WHILE THE FORMULA IS ENTERED. иF YOU'VE MADE A SYNTAX ERROR IN THE FORMULA, THE PROGRAM STOPS AND AN ERROR MESSAGE IS DISPLAYED. йUST CORRECT THE ERROR AND HIT <ретурн> UNTIL EACH DISPLAYED LINE IS ENTERED AND рун SENDS YOU BACK TO THE MAIN MENU. нOW, LET'S SET THE AXES. сELECT 2, AND YOU ARE ASKED TO SPECIFY THE ORIGIN. фOR THIS CASE, HIT <ретурн> AND THE DEFAULT VALUES OF 0,0 ARE ENTERED. нEXT, YOU'RE ASKED TO SET THE X TIC MARKS. хIT <ретурн> AND THE DEFAULT VALUE OF 1 IS ENTERED. фOR THE Y TIC MARKS, ENTER 10 AND HIT <ретурн>. тHE NEXT QUESTION ASKS IF YOU WANT THE ORIGIN AND TIC VALUES DISPLAYED ON THE GRAPH. хIT <ретурн>, AND THE VALUES WILL BE DISPLAYED. тHE MAIN MENU IS DISPLAYED AGAIN, WITH THE NEW VALUES SHOWN BELOW THE SET AXES SELECTION. иT'S FINALLY TIME TO PLOT. сELECT 3 FROM THE MENU, AND THEN SELECT 1 FROM THE PLOT MENU. еNTER 1 (OR -1 FOR FASTER, BUT CRUDER PLOT) OF FUNCTION 1. вHEN THE FUNCTION PLOT IS COMPLETE, A > APPEARS IN THE UPPER LEFT CORNER. хIT ANY KEY, AND YOU WILL RETURN TO THE PLOT MENU. тYPE 3 TO RETURN TO THE MAIN MENU, AND SELECT 4. сELECTION 4 IS THE JOYSTICK POINT FINDING ROUTINE. пLUG YOUR JOYSTICK INTO PORT 2, SELECT 1, AND HIT <ретурн>. тHE PLOT REAPPEARS WITH THE TURTLE PRESENT AT THE SCREEN CENTER. тHE TURTLE SPEED CAN BE VARIED BY PRESSING THE + AND - KEYS. мOVE THE TURTLE TO THE POINT OF INTEREST AND HIT THE FIRE BUTTON. тHE POINT'S COORDINATES ARE DISPLAYED IN THE LOWER RIGHT CORNER. ыOU'RE CERTAINLY NOT LIMITED TO GRAPHING POLYNOMIALS. сET THE AXES BACK TO THEIR DEFAULT VALUES (TYPE 2 FROM THE MAIN MENU AND THEN HIT <ретурн> TO ALL THE PROMPTS). еNTER ы=тан(ь) KEEPING THE SAME AXES AS BEFORE. нEXT TRY ы=1/ь. тHIS EQUATION WILL CREATE AN ERROR AT X=0 UNLESS YOU ANSWER Y TO THE AVOID A POINT? QUERY IN THE PLOT SECTION AND ENTER 0 AS THE POINT TO AVOID. сOME FUNCTIONS SUCH AS сяр DON'T DIGEST NEGATIVE NUMBERS VERY WELL SO YOU HAVE THE OPTION OF SPECIFYING POSITIVE X VALUES ONLY. оF COURSE YOU COULD JUST SHIFT THE AXES, BUT YOU MAY WISH TO PLOT ANOTHER FUNCTION ON THE SAME SCREEN WITHOUT A SHIFTED ORIGIN. тHE PLOTTING OPTION ALSO ALLOWS AUTOMATIC PLOTTING OF ALL THE ENTERED FUNCTIONS BY SELECTING 7 (OR -7). ыOU MUST PRESS A KEY WHEN THE > APPEARS, BUT THE ROUTINE STARTS PLOTTING THE NEXT FUNCTION INSTEAD OF RETURNING TO THE MENU. и WAS FORCED TO MAKE SOME COMPROMISES IN THE PROGRAM DUE TO THE 12K AVAILABLE MEMORY (AND MY INEXPERIENCE WITH цомал). тHE MOST SERIOUS COMPROMISE WAS THE ELIMINATION OF THE BULK OF THE CODE COMMENTS. еVEN WITH MINIMAL COMMENTS, THE FREE MEMORY AVAILABLE IS ONLY ABOUT 1/2K, SO YOU MAY WANT TO WATCH THE MEMORY SIZE IF YOU ENTER LARGE FORMULAS. (ыOU MUST HAVE AN EXPANDED MEMORY VERSION OF цомал 0.14 TO RUN THIS PROGRAM. тHE хи PROGRAM ON THIS DISK EXPANDS MEMORY.) аNOTHER WARNING IS ALSO IN ORDER. дO NOT RENUMBER THE FIRST SECTION OF THE PROGRAM (LINES 1-999). тHIS SECTION IS THE AREA WHERE THE DYNAMIC KEYBOARD ROUTINE MODIFIES PROGRAM LINES. тHERE IS NO SCREEN DUMP UTILITY BUILT INTO THE PROGRAM, BUT THERE ARE PLENTY OF DUMP ROUTINES AVAILABLE (TRY THE уTILITIES #2). и HOPE YOU ENJOY THE PROGRAM, AND и WOULD LIKE TO THANK дICK кLINGENS FOR HIS стр$ AND жал ROUTINE LISTED IN цомал тODAY #12.