Creating a cross pattern in a 128 x 128 matrix in MATLAB

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MLnoob5340
MLnoob5340 am 23 Sep. 2014
Kommentiert: Image Analyst am 30 Dez. 2020
I am trying get get a head start on courses and I've run into a sample problem in my textbook about creating a 128 x 128 of zeros and then filling in a cross pattern of ones in the center of this matrix. I am trying to minimize use of forloops
I was thinking of concatenating matrices, but I am a MATLAB newbie it would also be annoying to designate which positions need to be filled and what not if I concatenate
I am wondering if there is a rectangle function that I can use to create a horizontal and vertical rectangle to make the cross pattern or any other suggestions
Also, is there a way to zoom out on the output....as it is very hard to check a 128 x 128 matrix??? (since the output is broken up into rows and columns)
Thank you very much

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Image Analyst
Image Analyst am 23 Sep. 2014
Do you mean like this:
workspace;
m = zeros(100)
row1 = 45;
row2 = 54;
m(row1:row2,:) = 255;
m(:,row1:row2) = 255;
image(m);
You can use the variable inspector to look at the values, just double click on the variable name in the workspace panel.
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Omar Alabid
Omar Alabid am 30 Dez. 2020
Guys i need your help!!!! I have question Using a built-in function to create a 30 x 30 matrix, where the middle two róws and the middle two columns are filled with 2's while the rest are 4's.
Image Analyst
Image Analyst am 30 Dez. 2020
m = 4 * ones(30, 30);
m(15:16, :) = 2;
m(:, 15:16) = 2;

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