Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension.

Hi, I am trying to handle 3D matrices and regular vectors in a same line of code. Matrix and vector increase by 1 at each iteration.

Issue: Error using reshape. Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension.

Description of Code:

obj.R = 0.1;

NUM_gz = 100;

NUM = 100,

initially NUM = 100 but after each iteration it increments by 1. whereas, NUM_gz remians fixed.

Which means at each my r(:,w) is [3, 1] vector and reshape(obj.D(1,w,:),[3, 1]) should convert it to [3, 1] so that dimensions remian consistant. apperently, there should not ne any error. However, I am getting the above error continuously.

I appreciate any help,

organ.r = zeros(3,NUM); 
organ.D = zeros(3,NUM,3);

I am using these vectors and matrices within different functions and therefore object name might seem inconsistant but that is besides the point.

n1 = 64;
            w  = 1: length(obj.r)-obj.NUM_gz;
            for n = 1:n1
                L = obj.r(:,w) + obj.R * cos(2*pi*n/n1) * reshape(obj.D(1,w,:),[3, 1]) + obj.R * sin(2*pi*n/n1) * reshape(obj.D(1,w,:),[3, 1]);
                plot3(L(1),L(2),L(3),'Color','k', 'linewidth', 0.1)  
            end

Answer 1

[Steven Lord]

Set an error breakpoint and run your code. When you reach the line where you call reshape confirm that obj.D(1, w, :) is the size that you believe it to be. If it isn't identify for which value of the loop variable the problem occurs, set a conditional breakpoint (described on that same documentation page to which I linked above) on that line for when the loop variable reaches its previous value (so if the problem occurred for n = 9 stop when n == 8), and step through the loop to see when the size of obj.D(1, w, :) changes from what it should be.

Answer 2

[Abdul Jabbar]

great. worked for me. Thanks