Using variable value as text?

[ShadyV]

I have been searching for days. I apologize if this is very basic. I don't know terms or coding at all I just type things in lisps until they do what I want. I don't know how to ask the question so that is probably why I can't find the answer by searching.

 

How do I use the RW value in a command line to draw a line? I want to start the line at 0,0 and end at 0,26.  

(setq RW 26)  ;user set value from dcl 

(Command "line" "0,0" "0,RW" "")

How do I place the RW in there so the result is this?

(Command "line" "0,0" "0,26" "")  

 

 

[Steven P]

So... if you put something between  " it is read as a string, a fixed thing and no calculation is done to work out what it is. You'll need to write it out so that the LISP knows to evaluate that part. 

 

To make a point you can use a list, instead of "0,RW" try (list 0 RW)

(Command "line" "0,0" (list 0 RW) "")

 

a second way to do this might be to create a string something like:

 

(setq pt (strcat "0," (rtos RW)))
(command "line" "0,0" pt "")

Here you are making a text string, pt, since RW is a number (or should be?) you need to convert that to a string to join to another string, which is what RTOS does. The reverse is true, if RW is text, and not a number in my first example you;d need to use ATOF

Second note here, (strcat "0," (rtos RW))can be put in place of pt in the second line to make your code a bit shorter.

[Tharwat]

(command "line" "_none" '(0.0 0.0 0.0) "_none" (list 0.0 RW 0.0) "")

 

[ShadyV]

Thank you both. All the options work for me! To stay true to my horrible programming style I will chose the most complex way to put this in and keep my code as long and ugly as possible. lol