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String Comparisons in LabTalk

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T O P I C R E V I E W
a_user	Posted - 08/20/1998 : 7:14:00 PM I'm trying to allow a user to enter a list of columns, and then the script makes an adjacent column and fills it with error data... here's the relevant code [ %n = name of a column from the users list ] /* find the column name in the list */ j=1; colnum = -1; for (j=1; j <= wks.nCols ; j+=1) { wks.col = j; %g=wks.col.name$; type %n %g $(j); if(%n==%g) { colnum = j; type (^^); }; When I run this on worksheet with cols A B C D, i see: (When %n="B") B A 1 B B 2 ^^ B C 3 B D 4 B E 5 (then the script adds column B2 and tries to find column C) C A 1 C B 2 C B2 3 C C 4 ^^ C D 5 C E 6 ^^ (So the script adds a column C2 where it made the last match, ie at the end then tries to find column D) D A 1 ^^ D B 2 D B2 3 ^^ D C 4 D D 5 ^^ D E 6 D C2 7 ^^ So the comparison %n==%g is generating false positives. I've "typed" the variables it looks at, so I don't understand what's going on... I'd appreciate any help...
5 L A T E S T R E P L I E S (Newest First)
CStorey	Posted - 04/08/2002 : 12:22:54 PM Sorry Jose, you're right and I didn't do enough testing. It agree that the "'" is the culprit. If you add anoter type command in after the variable declaration, maybe something like... %a=result'; %b=result; `Type "-------------------------------\r\nYes or No does %A == %B ??"; if (%a == '%b') {....` then the type command comes out with the " quotes in place. It seems like the "'" is not treated properly. I would suggest that LabTalk use all three quotes ",',` interchangeably, making it possible to imbed any of them inside a string. Example: %A="It's time."; --> It's time. %B=`"Come over here, it's ready", he said.`; --> "Come over here, it's ready", he said. %C="``` E=mc^2 ```"; --> ``` E=mc^2 ``` Craig Craig Storey Origin WebRing Member - http://g.webring.com/hub?ring=originwebring
Jose	Posted - 04/05/2002 : 06:30:11 AM That doesn't work properly in my version 7.0. I take your code and change the if condition using (%a==%b') and also get a yes. Once I remove the quotes I always get a yes doesn't matter what I compare, but including the quotes doesn't give the desired result. (The returned value in the following examples is bold). %a=result'; %b=result; if (%a==%b) type yes; else type no; if (%a==%b') type yes; else type no; if (%a=="%b'") type yes; else type no; if (%b'=="%a") type yes; else type no; if ("%b'"=="%a") type yes; else type no; Of course this seems to be a conflict with quotes. If instead of it I use a dot, comparison works fine: %a=result.; %b=result; if (%a=="%b.") type yes; else type no; if (%b.=="%a") type yes; else type no; if ("%b."=="%a") type yes; else type no; Do you find another way? j. Jose Vi�a, Origin WebRing member P.S. By the way, using another variable doesn't solve the problem... Edited by - Jose on 04/05/2002 06:36:57
CStorey	Posted - 04/04/2002 : 4:41:33 PM The following works for me. I just removed the quotes and tested to make sure it caught the spaces properly. %a=no result'; %b=result; if (%a==no %b') { ; type -b YES; } else { type -b No; }; Alternately you could use another variable to compare them, like %c="%b'"; %a==%c.... but that uses up one of a precious few LabTalk string variables. Craig Storey Origin WebRing Member - http://g.webring.com/hub?ring=originwebring Edited by - CStorey on 04/04/2002 16:45:03
Jose	Posted - 04/04/2002 : 1:40:55 PM How do I compare strings that contain one quotation mark? The following doesn't work... %a=result'; %b=result; if ("%a"=="%b'") type yes; Jose Vi�a, Origin WebRing member
a_user	Posted - 08/20/1998 : 7:17:00 PM Response:String Comparison When you are comparing strings, you must use double quotes on the right-hand side of the condition. For example: if(%N=="%G") type "same"; if(%N=="Navy") type "The color is navy.";

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