Variables in a matrix

Question

vincent stevenson 2018-11-4

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回答： Yash Ubale 2018-11-13

I am trying to generate a 60x6 matrix and have each column be assigned a variable and randomly generate a value for each space. For example the first column be one variable and have it generate a random number for each location in that column and second column do the same thing independent of the first. So far I have,

m=zeros(60,6);

F=m(1);

P=m(2);

T=m(3);

r=m(4);

t=m(5);

F=1000+rand(1)*99000;

P=100+rand(1)*900;

T=10+rand(1)*90;

r=.05+rand(1)*.04;

t=.0001+rand(1)*.0008

When I run this it doesn't generate a matrix and every number is the same.

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Answer 1

Yash Ubale 2018-11-13

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Hello,

The problem here is that, you are storing the columns of matrix 'm' into different variables and then making changes to those variables and not the original matrix 'm' in a way that they store only one single value. Instead, you can try executing the following code :

m = zeros(60,6);
m(:,1) = rand(60,1)*99000 + 1000;
m(:,2) = rand(60,1)*900 + 100;
m(:,3) = rand(60,1)*90 + 10;
m(:,4) = rand(60,1)*0.04 + 0.05;
m(:,5) = rand(60,1)*0.0008 + 0.0001;

'rand(m,n)' generates a randomely generated matrix of size m x n. The numbers are between 0 and 1 which are drawn from a uniform distribution.

'rand(1)' will generate only one random number and not an entire column.