How do I create a square matrix based on user input?
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I'm trying to write a program that asks the user what the dimensions of their square matrix are then takes that number, asks for each entry and creates the matrix for the program to use for the rest of the questions. I know how to create one row at a time, but I can't figure out how to put all the rows together to make one matrix.
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Answers (5)
Anuj
on 21 Feb 2014
One simple way for this can be, Suppose you have square matrix of order n. So you have n^2 elements. You can enter all the elements one by one and change it into square matrix like this-
n=input('order of your square matrix is? ')
for i=1:n^2;
a(i)=input('elements-');
end
a=reshape(a,n,n)'
Regards
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Akash h.r
on 16 Aug 2016
Edited: DGM
on 3 Mar 2023
m=input('row')
n=input('column')
for i=1:m
for j=1:n
a(i,j)=input('elements-')
end
end
a=reshape(a,m,n)
Gowtham K
on 25 Dec 2021
m=input('row')
n=input('column')
for i=1:m
for j=1:n
a(i,j)=input('elements-')
end
end
a=reshape(a,m,n)
b= a+a
c=a-a
m=a*a
s= a^2
2 Comments
DGM
on 25 Dec 2021
Edited: DGM
on 25 Dec 2021
The code you posted works for 2x2 just fine. It's entirely unnecessary, tedious and error-prone to force users to enter arrays using input(), but for some reason it's popular to teach people bad ideas like this.
If you have to do things this way, at least make it readable.
% use meaningful prompts with clear formatting and output suppression
m = input('number of rows: ');
n = input('number of columns: ');
a = zeros(m,n); % preallocate
for i=1:m
for j=1:n
a(i,j)=input(sprintf('enter a(%d,%d): ',i,j)); % again
end
end
%a = reshape(a,m,n) % this does nothing. the array is already this shape
b = a+a
c = a-a
m = a*a % this is matrix multiplication, not elementwise multiplication
s = a^2 % same
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