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I want to randomly have numbers added to a matrix

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Daniel Gray
Daniel Gray el 11 de Jul. de 2017
Cerrada: MATLAB Answer Bot el 20 de Ag. de 2021
I have a 300x300 zeros matrix and I want to have numbers between 0 and 1 (inclusive) randomly placed amongst the matrix, the numbers can be repeated (and ideally will be repeated completely randomly). Any help would be great.

Respuestas (3)

KSSV
KSSV el 11 de Jul. de 2017
Editada: KSSV el 11 de Jul. de 2017
A = round(rand(300,300)) ;
or
A = randi([0 1],300,300)

Star Strider
Star Strider el 11 de Jul. de 2017
Use the randi function:
M = randi([0 1],300);
  3 comentarios
KSSV
KSSV el 11 de Jul. de 2017
That case you should use rand
Jan
Jan el 11 de Jul. de 2017
Editada: Jan el 11 de Jul. de 2017
X = rand(300, 300);
KSSV and Star Strider have suggested randi and rand already. Although the code did not solve your problem completely, the hints are useful already: Read the documentation of the suggested commands to find out, how to use them such, that it satisfies your need. The "See also" lines on the bottom of the docs are very valuable.
I suggest to use the forum not only as a service for complete solutions, but to consider all details mentioned here to improve your own Matlab skills.
In German this is called "mitdenken", but I cannot translate this to English. It doubles the power of the given answers. :-)

Image Analyst
Image Analyst el 11 de Jul. de 2017
This will do it:
% Create a matrix of all zeros
m = zeros(300, 300);
% Get locations for random changes
% Define the number of random numbers you want placed.
numRandomNumbers = round(.3 * numel(m)); % For example 30%
% Get their locations, randomly arranged.
linearIndexes = randperm(numel(m), numRandomNumbers);
% Assign random numbers to those locations
m(linearIndexes) = rand(1, numRandomNumbers);
imshow(m)

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