Script that performs the same as MATLAB function.

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David Hughes 2015-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/232225-script-that-performs-the-same-as-matlab-function

编辑： Walter Roberson 2015-8-4

I am looking to create scripts for some internal functions: repmat, fliplr, flipud, and rot90. I am familiar with how each works but I am not sure where I should start. I have two of the four below.

%This script will perform the same operation as rot90
x = input('Enter the matrix: ');
[m,n] = size(x);
[i,j] = length(x);
y = input('Which direction to rotate the matrix\nEnter -90 or 90: ');
newvec = 0; %This is the variable for the result
if y == -90
    %rotate counterclockwise
elseif y == 90
   %rotate clockwise
end
%This script will duplicate the user entered matrix and create a new matrix
%by the number of rows and columns specfied by the user. 
mat = input('Enter your matrix: \n');
rows = input('Enter number of rows: \n');
cols = input('Enter number of columns: \n');
newvec = zeros(rows,cols,mat);

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Steven Lord 2015-8-4

And the full text of the error message you receive from your repmat-like script is ... ?

[BTW, I'm assuming you're doing this for homework. If not, I recommend you simply use the functions included with MATLAB.]

David Hughes 2015-8-4

编辑：Walter Roberson 2015-8-4

在 MATLAB Online 中打开

Yes this is an assignment. The error I was getting was from some changes I made. I've gone back to the beginning and made some additions. I realized I needed to allocate the memory for the resulting matrix. Not getting an error but I am stuck. I am getting the correct size of the resulting matrix but not the correct values. I know that adding i + j in the nested for-loop is not the correct syntax for the correct result. I added i + j as a test and this is where I am stuck.

clear all
clc
mat = input('Enter your matrix: ');
rows = input('Enter number of rows: ');
cols = input('Enter number of columns: ');
[m,n] = size(mat);
newvec = zeros(rows*m,cols*n);
for i = 1:size(newvec)
    for j = 1:size(newvec)
        newvec2(i,j) = i + j;
    end
end
disp(newvec2)