How do I create a user generated matrix in Matlab?

Hello,

I am a student who has been tasked with writing a program that asks the user to define how many rows and columns a matrix should have. After which point, the user will be again asked what values go in each cell of the matrix. Where I am having trouble, is figuring out how to take the number of rows and columns that a user defines, and turn that into a matrix.

This is what I have so far:

Rows = input('Please input the number of rows you would like to have: ');
disp(' ');
Columns = input('Please input the number of columns you would like to have: ');
disp(' ');

If, for example the user wanted a matrix with 1 row and 4 columns, how would I go about generating said matrix given the user input?

Edit: Is it possible to achieve what I am asking, without simply having a user input a whole matrix?

[Mohsin]

Yes you can acheive without asking user, here is how

Matrix = randi([3,10],3,3)

It will create a matrix of order 3x3 and of number between 3 and 10

[Feza Güngör]

useful bro, thanks !

Answer 1

[David Hill]

M = input('Input matrix: ');
%then input [1,2;3,4;5,6;7,8;9,10] for a matrix of 5 rows and 2 columns, or whatever matrix you want.

[Patrick Spencer]

Is there anyway to make it a multi step process? Such that the user is asked about various aspects of the matrix, rather than simply inputting the entire matrix at once?

Such as:

How many rows?

How many columns?

What number would you like for cell 1/2/3...?

[David Hill]

M=zeros(Rows,Columns);
for k=1:Rows
    for m=1:Columns
        M(k,m)=input(sprintf('Input the matrix value for (%d,%d): ',k,m));
    end
end

[Patrick Spencer]

That did the trick, thank you very much,

[Thomas Tilley]

Would there be a way to output a comment if the determinant is zero?

[Steven Lord]

Yes, but if you're thinking of using the determinant to decide if the matrix is singular that's not a good idea. A non-zero scalar multiple of the identity matrix isn't singular, is it? But dA says it is. The determinant of A underflowed to 0.

A = (1/64)*eye(500);
dA = det(A)

B is nearly singular and C is a non-zero multiple of B so it too should be nearly singular. But C's determinant is not close to 0.

B = [1 1; 1 1+eps]
det(B)
C = 1e10*B;
det(C)

[Thomas Tilley]

Thank you! How would you implement this into the code above?

[Nhat Tien Le]

how to input each vector in a mtrix is a matrix sir?

[Rohit D Kashyap]

Is there any way of adding user generated matrix in loop.

Say i Want to ask the user to add n-number of matrix. How do i do that??

[Sara Marium]

thank u so much! :)

Answer 2

[Abhishek Pawarq]

a = input('Enter the number of rows');

Unable to run the 'fevalJSON' function because it calls the 'input' function, which is not supported for this product offering.

b = input('Enter the number of coloumns');
for i=1:a
    for j=1:b
       p(i,j)=input('Enter the elements');
    end
end
p=reshape(p,a,b)

[Sarah]

is there a way to combine this into on statment for example [x,y] = input('Enter rows and columns')

Answer 3

[JEERU]

a = input('Enter the number of rows');

b = input('Enter the number of coloumns');

for i=1:a

for j=1:b

p(i,j)=input('Enter the elements');

end

end

p=reshape(p,a,b)

Answer 4

[Aryan]

a = input('Enter the number of rows');

b = input('Enter the number of coloumns');

for i=1:a

for j=1:b

p(i,j)=input('Enter the elements');

end

end

p=reshape(p,a,b)