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+--- Thread: Now don't run ? (/thread-6207.html)
Now don't run ? - ggauny@live.fr - 05-06-2016 06:43 AM
Hi,
An old program from Mic Nick now don't run. I don't know why, may be help ?
Thanks.
RE: Now don't run ? - Tim Wessman - 05-06-2016 02:01 PM
Hello,
The reason is because when INPUT(f,"...") is run, the expression you type is EVALUATED. If X=2, and you type X^2-1, on exit the INPUT form evaluates and you get 2^2-1, or 3 as your value for f.
You can either put your expression inside ' ' using the two keys [SHIFT][ ( ) ], or put in " " around your expression.
'X^2-1' or "X^2-1" will both work.
You can modify the program to be like this to avoid needing to do ' ' or " ".
INPUT({{f,[2]}}, ....);
RE: Now don't run ? - ggauny@live.fr - 05-07-2016 06:44 AM
Hi Tim,
Very many thank you. It run now.
Good day.
RE: Now don't run ? - leprechaun - 05-07-2016 07:30 AM
Cool.
Could someone elaborate a bit on the reason that the proposed sollution works? Would be really helpful. I am confused because of the double list and the vector [2] which I cannot explain.
edit: well some thinking and a fresh cup of coffee made me realize that [2] is the allowed type String. Is it right that in this case the entry is converted to an unevaluated string because you specified that the allowed type is string?
RE: Now don't run ? - Tim Wessman - 05-07-2016 07:58 PM
Exactly, specifiying string means it will not evaluate anything. Storing into F1:="<string>" is a special case and will convert to an expression.