how to i attain a matrix with 1 to n

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Austin
Austin 2013-10-1
回答： Austin 2013-10-1
when i prompt a user for a value for m,n how do i attain a matrix such that the first row of a matrix be 1 to m for eg.if a user input a value of 9 for m the first row of a matrix will be: 1 2 3 4 5 6 7 8 9
similarly, if the user enter a value of 6 for n, then my first column will be 1 2 3 4 5 6
please kindly advise,thanks alot!
  2 个评论
Wayne King
Wayne King 2013-10-1
You have not said how you are filling in the other entries of the matrix.
We can't have the user get 9 columns with your row vector and then have one column of 6 elements. You have created a 9x6 matrix, how do you want us to fill in the missing elements?
Austin
Austin 2013-10-1
hi,Wayne King,as for the other missing elements will be zeros.

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采纳的回答

Wayne King
Wayne King 2013-10-1
编辑：Wayne King 2013-10-1
See my comment above. If you want us to fill the remaining elements with zeros.
dims = input('Provide the row and column dimension of the matrix in brackets, e.g. [6 9] \n');
% the user enters [6 9]
X = zeros(dims(1),dims(2));
X(:,1) = 1:dims(1);
X(1,:) = 1:dims(2);

更多回答（3 个）

Austin
Austin 2013-10-1
r=input('please inducate the number of rows you want for the matrix') c=input('please indicate the number of columns you want for the matrix') mat=zeros(r,c)
this is what i have so far..
Austin
Austin 2013-10-1
编辑：Wayne King 2013-10-1
r=input('please indicate the number of rows you want for the matrix')
c=input('please indicate the number of columns you want for the matrix')
mat=zeros(r,c)
mat(:,c)=1:r
mat(r,:)=1:c
but i keep getting this error..:
Subscripted assignment dimension mismatch.
Error in Untitled7 (line 6) mat(:,c)=1:c
  1 个评论
Wayne King
Wayne King 2013-10-1
You changed your code so now it works, initally you had the wrong numbers in your column and row assignment.
The above will work but you are just filling the last column and last row, is that what you want?

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Austin
Austin 2013-10-1
arrr i found out that i entered r and c in the wrong line,thanks alot Wayne King your answer did helped me alot!

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