Create a list with 4 real numbers

[etilley327KA]

What am I doing wrong here? FC is a global variable from another lisp, with four blocks.

(defun c:wert (/ i e c cl)
(if (= (sslength fc) 4)
(progn
(repeat (setq i (sslength fc))
(setq e (ssname fc (setq i (1- i))))
(setq c (getpropertyvalue e "ELEV2"))
(setq cl (cons (rtos c 2 2) cl))
)
(print cl)
)
(prompt "\nMore than one form selected")
)
(princ)
);end

[Kent1Cooper]

Does an Attribute with the tag "ELEV2" exist in all the Blocks?

Is 'fc' a selection set, such as the code appears to be designed for, or perhaps a list of entity names instead?

Define "wrong."  What are you getting?  Are there any error messages?  Etc., etc.

[etilley327KA]

FC is a selection set that all have the attribute "ELEV2". I get bad argument type: numberp: "156.20" : error#2. There are four strings "156.20" "156.18""156.16" "156.13".

[Kent1Cooper]

If 'c' is an Attribute value, it's already a text string, so you can't apply (rtos) to it.  In your final 'cl' list, do you want them as text strings or as numbers?  Either way, if you want them to 2 decimal places, do they [or might they sometimes] have a different number of decimal places as Attribute values?

If, for example, you want them as strings without changing their number of decimal places, then this:

(setq cl (cons (rtos c 2 2) cl))

should be just:

(setq cl (cons c cl))

[etilley327KA]

So how might I convert this selection set to real numbers?

[Kent1Cooper · Accepted solution]

Read about the (atof) and possibly (distof) functions.

[etilley327KA]

Didn't know about that, thanks.