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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回答 (5 件)
Anuj
2014 年 2 月 21 日
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
2016 年 8 月 16 日
編集済み: DGM
2023 年 3 月 3 日
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
2021 年 12 月 25 日
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 件のコメント
DGM
2021 年 12 月 25 日
編集済み: DGM
2021 年 12 月 25 日
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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