RE: input string use in a for-statement

[Richardson, Anthony]

> -----Original Message-----
> From: address@hidden [mailto:help-octave-
> address@hidden On Behalf Of Carnë Draug
> Sent: Monday, August 20, 2012 10:20 AM
> To: Nikolai
> Cc: address@hidden
> Subject: Re: input string use in a for-statement
> 
> On 20 August 2012 15:48, Nikolai <address@hidden> wrote:
> > Hello,
> >
> > I have this piece of code:
> >
> > Var1 = xxx;
> > Var2 = xxx;
> > ...
> > ...
> > EingParameter = input ("Veränderbaren Parameter: ","s") EingPStart =
> > input ("Parameter Startwert eingeben ") EingPEnd = input ("Parameter
> > Endwert eingeben ") EingPSteps = input ("Paramter Anzahl eingeben ")
> >
> > for EingParameter = linspace(EingPStart,EingPEnd,EingPSteps)
> >
> > What I want is, for the user to enter the name of a variable  in the
> > first input prompt so that the for-expression uses that corresponding
> > variable. I know that this code won't work the way i want it to, but
> > ideally it would look like this.
> >
> > Does anyone know what I would have to do, to get this working the way
> > I want to?
> >
> > Thanks in advance for any help!
> 
> I don't understand. It works for me:
> 
> octave:8> var1 = 45;
> octave:9> var2 = 78;
> octave:10> var3 = 99;
> octave:11> EingPStart = input ("Parameter Startwert eingeben ") Parameter
> Startwert eingeben var3 EingPStart =  99
> 
> Carnë

I believe the OP wants to be prompted for the variable name.  You can use the 
eval function to do what you want.  Here is an example script:

varname = input("Enter var name: ", "s");

stval = input("Enter starting value: ");
edval = input("Enter ending value: ");
snval = input("Enter number of values: ");

eval(sprintf("%s = linspace(%d, %d, %d)",varname, stval, edval, snval));


Add another ";" before the second " to suppress display of the variable value 
during evaluation.

Tony Richardson