Script issue between two different versions

Hi, I was wondering if you may be able to tell me if there is a dramatic difference between the 2010b version and the 2011a version. I wrote a simple script in the 201b version, where is works fine, but when I try and run it in the 2011a version I get a error message half way through.

[SCd indented code]

??? Error using ==> mldivide
Matrix dimensions must agree.

Error in ==> EET3300_HW1 at 17
H = 1/(((WW).^4+2.6131*(WW).^3+3.414*(WW).^2+2.6131*(WW)+1));

The script is as follows:

% 2-26-12
% Jeff Johnson
% EET3300

clc
clear all

%Enters in variables into a matrix
freq_cut = input('Enter the frequency cutoff:');
num = input('Enter in the number of frequencies:');
for k = 1:num
  f(k) = input('Enter in a frequency:');
end

syms W Wf
WW = (j*f)/(2*pi*freq_cut);
H = 1/(((WW).^4+2.6131*(WW).^3+3.414*(WW).^2+2.6131*(WW)+1));
for cnt = 1:num
  Wf = (cnt-1)*freq_cut*2*pi;
  HH = subs(H,W,Wf);
  HA = abs(HH);
end
 HH
 HA

ANy help you may be able to provide would be greatly appreciated.

Thank you,

Jeff

Answer 1

[Sean de Wolski]

It's not an issue between version incompatibility but rather dependent on your input(). It would not fail if everything is a scalar, but will if you input a vector or matrix. Thus is num is one, it'll work but if it's two or more - BOOM!

It looks like it should be:

H=1./(((etc...

And:

doc vectorize

to have this automagically done for you.

vectorize('H = 1/(((WW).^4+2.6131*(WW).^3+3.414*(WW).^2+2.6131*(WW)+1));')