MatLab - Error using run => Input argument is undefined - matlab

Question

As a MatLab newbie, I have problems running the following script:
function [ newarray ] = reshapeIm( array, period )
%reshapeIm(array, period) Summary of this function goes here
% Detailed explanation goes here
le = length(array);
fra = le/period;
array = [array, zeros(1, ceil(fra)*period-le)];
newarray = reshape(array', period, []);
end
load('1200rpm_shak3.mat');
cRounds = 54;
mylength = 100;
thetas = (1:cRounds*mylength).*2*pi/mylength;
thetas0 = (1:mylength).*2*pi/mylength;
figure;
plot(z1(1:300), '.-');
plot(z2(1:300), '.-');
z1s = z1;
z2s = [z2(mylength/4+1:end) z2(1:mylength/4)];
z3s = [z3(mylength/2+1:end) z3(1:mylength/2)];
z4s = [z4(mylength*3/4+1:end) z4(1:mylength*3/4)];
dr = 1/4.*(z1s+z2s+z3s+z4s); % gemittelt
drs = reshapeIm(dr, mylength);
drs_std = std(drs, 1, 2);
drs_meanstd = mean(drs_std);
figure;
polar(thetas, 250000+200*dr);
figure;
polar(thetas0', 250000+200*mean(drs,2));
The command window says:
??? Error using ==> run
Input argument 'array' is undefined.
I suppose, that's because the script was written for a newer MatLab, but I use 5.3.

Answer 1

Functions need to be in their own files. You cannot define functions within a script file. So, to get your code to work at all, you need to move the function that is at the top of your file (which I copied below) into its own file. Name the file "reshapeIM.m" and save it in the same directory where you are doing your work.
function [ newarray ] = reshapeIm( array, period )
%reshapeIm(array, period) Summary of this function goes here
% Detailed explanation goes here
le = length(array);
fra = le/period;
array = [array, zeros(1, ceil(fra)*period-le)];
newarray = reshape(array', period, []);
end
Then, after removing the function from your script, save your script and run it again. This should solve the problem with regards to the function. You may have other errors, but this should take care of the error that you reported.