HELP - submatrix incorrectly defined ;(

I originally posted this to the Scilab group assuming i just had a 
syntax error. While waiting for a response, I started wondering if I was 
also headed for some DSP specific pitfalls.

Comments welcome.


***********

I know I'm making a basic (no pun intended) error.
But i just can not find the proper syntax.
My code is:


sheets = readxls('E:\parasitic.xls')
s1=sheets(1);             //get the first sheet
dwave=s1(:,2);
y=size(dwave,'r');
k=max(abs(dwave([2:y])));
dwave=dwave([2:y])/k;          //first line is col titles
                  //normalize array
for i=1:19
     j=500*(i-1);
     farray(i,:)=fft(dwave(j+1:j+500));
end


Scilab-4.0 chokes on
    farray(i,:)

I'm sure I've seen that syntax in the help files.
What obvious thing am I missing?

My eventual goal is a 3D surface plot of farray.
farray will eventually be larger than 19x500.
The data I'm using is a simple/simplistic test case.

corrections, pointers, general guidance appreciated.
Thank you.

Richard Owlett wrote:

> I originally posted this to the Scilab group assuming i just had a 
> syntax error. While waiting for a response, I started wondering if I was 
> also headed for some DSP specific pitfalls.
> 
> Comments welcome.
> 
> 
> ***********
> 
> I know I'm making a basic (no pun intended) error.
> But i just can not find the proper syntax.
> My code is:
> 
> 
> sheets = readxls('E:\parasitic.xls')
> s1=sheets(1);             //get the first sheet
> dwave=s1(:,2);
> y=size(dwave,'r');
> k=max(abs(dwave([2:y])));
> dwave=dwave([2:y])/k;          //first line is col titles
>                  //normalize array
> for i=1:19
>     j=500*(i-1);
>     farray(i,:)=fft(dwave(j+1:j+500));
> end
> 
> 
> Scilab-4.0 chokes on
>    farray(i,:)
> 
> I'm sure I've seen that syntax in the help files.
> What obvious thing am I missing?
> 
> My eventual goal is a 3D surface plot of farray.
> farray will eventually be larger than 19x500.
> The data I'm using is a simple/simplistic test case.
> 
> corrections, pointers, general guidance appreciated.
> Thank you.


ARGGHH ;<

   farray(i,:)=fft(dwave(j+1:j+500));
should be
   farray(i,:)=fft(dwave(j+1:j+500))';