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count rows in matrix ?

Asked by Rakesh Praveen on 7 Nov 2011
Latest activity Answered by Thulitha Theekshana on 17 Jul 2019 at 20:57
hey, i want to know is there a way to get how many rows are there in a given matrix. like for example when we say 'length(A)' it can give number of columns in a matrix(A), likewise can we know about number of rows ?
thank you.

  3 Comments

Use height(T)
https://www.mathworks.com/help/matlab/ref/height.html
height() doesn't work on matrices -- it only works on tables.
If for example your matrix is A, you can use : size(A,1) for number of rows. size(A,2) for number of columns. Also there are some other ways like : length ( A(:,1) ) for number of rows.

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4 Answers

Answer by Oleg Komarov on 7 Nov 2011
 Accepted Answer

size(A,1)

  3 Comments

thank u very much oleg komarov
Thank you so much, that's also what I want :)
Pooja
on 22 Sep 2014
It workd for me also. Thankyou Oleg Komarov

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Answer by Image Analyst
on 7 Nov 2011

For a 2D matrix:
[rows columns] = size(array2D);
or, in general,
sizeOfMatrix = size(yourMatrix);

  1 Comment

thank u very much image analyst

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Answer by Ashutosh Kumar on 22 Jul 2016

length(A) gives you maximum out of the matrix made by calling the size,so it doesn't give you column(A) and for calling column(A) you need size(A,2) and for row you need size(A,1)...like suppose you have a 5*4 matrix then length(A) will give you 5 number of rows not 4...Hope that will help others I myself used length(A) and ended up making a wrong code and took me 2 hours to do it right

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Answer by Thulitha Theekshana on 17 Jul 2019 at 20:57

I think the best way is to use size(x,y) function.
ex: if you want to get the height, size(matrix_name, 1). Here the second variable denotes the dimensioin you need to measure. From one it means the number of rows or the first dimension. From 2 it means the number of columns or the length. So I think you get the idea,

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