How can I create a matrix of black and white blocks given probability p of being black or white?

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Gaëtan Poirier 2017-12-21

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评论： Gaëtan Poirier 2017-12-21

I want to create a 10x10 matrix of 0's. There is a probability p of the 0 becoming a 1. If the block is a 1, the block is black, if 0, the block is white.

I don't really know how to iterate this:

I assume I would start with the given matrix. I would use

zeros(10,10)

and then iterate through using random numbers

if p<0.5 % I don't know how to change from 0 to 1

then how would I visualize the matrix in the colors?

Thank you for and help?

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Answer 1

Image Analyst 2017-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/374113-how-can-i-create-a-matrix-of-black-and-white-blocks-given-probability-p-of-being-black-or-white#answer_297354

在 MATLAB Online 中打开

Try this:

% Define parameters.
rows = 10;
columns = 10;
percentage = 0.5;
% Create initial matrix of all zeros.
m = zeros(rows, columns) 
% Figure out how many elements need to be set to 1.
numIndexes = round(percentage * rows*columns)
% Use randperm() to get that number of elements from random locations:
indexesToSet = randperm(rows*columns, numIndexes)
% Set those indexes to 1
m(indexesToSet) = 1