create a multidimensional array in matlab

Question

i am creating a multidimensional array in matlab which has three paramter , number , width and height

A = randn(number,width,height)

My problem is number is dynamic variable which increase when it find objects in the text file. How i am suppose to make the number variable dynamic,

I tried this but it didnt worked

A = randn(:,width,height)

First you should find number, then you should call randn. — Dennis Jaheruddin
– Dennis Jaheruddin, Commented Feb 8, 2013 at 10:09
I cant , its like words are hidden in a text file. it can be zero or can be maximum. — Wajahat Kareem
– Wajahat Kareem, Commented Feb 8, 2013 at 10:10
Can you then give a description of your variables and a stepwise explanation of what you are trying to do? This is not enough information to help you. — Dennis Jaheruddin
– Dennis Jaheruddin, Commented Feb 8, 2013 at 10:11
Do you need the data to be normally distributed over all the matrix, or you just chose randn to create a matrix as if it is zeros or ones? — zenpoy
– zenpoy, Commented Feb 8, 2013 at 10:41
I am creating a empty matrix of dimension 3, and popualting with random number, in future in will fill it with the data coming from a text file. I know the object size (width and height) but dont know how much objects are these — Wajahat Kareem
– Wajahat Kareem, Commented Feb 8, 2013 at 10:44

santiago_apr1 · Accepted Answer · 2013-02-08 10:14:30Z

3

i = 0;
when (object in text file)
i = i+1;
A(i,:,:) = data;
end

data is of size - width x height

answered Feb 8, 2013 at 10:14

santiago_apr1

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1 Comment

or just append A = []; while A = [A; data] end here the size is (number x width, height) You can later make it 3D matrix using reshape....

zenpoy · Accepted Answer · 2013-02-08 10:44:42Z

1

first count the number and then allocate the matrix accordingly.

i = 0;
when (object in text file)
i = i+1;
end

A = randn(i,width,height);

answered Feb 8, 2013 at 10:44

zenpoy

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but then i have to run the loop again to get the objects.

I thought you just needed to count the objects. You can get them during the first loop.