Question

Matlab problem

Write a function matsort to sort all of the values in a matrix (decide whether the sorted values are stored by row or by column). It will receive one matrix argument and return a sorted matrix. Do this without loops, using the built-in functions sort and reshape. For example: >> mat mat- 4 5 2 1 3 6 7 8 4 9 1 5 >> matsort(mat) 1 4 6 1 4 7 2 5 8 3 5 9 mat [45 2; 1 3 6; 7 8 4; 9 1 5] myMat matsort (mat)

Answer 1

matsort m:
A user defined function that sorts all elements of matrix M and then returns
sorted matrix.Elements are sorted in ascending order column wise.Save this function in your matlab scripts.

function A=matsort(M)
%MATSORT Sorts all elements of matrix M and then returns
%sorted matrix elements are sorted in ascending order
%cloumn wise
%format of call:matsort(M)
%Returns a matrix
%Get the size of M
[r,c]=size(M)
%Use linear indexing to treat M as a vector built column
%wise sort the vector then reshape back into the
%original size
A=reshape(sort(M(1:numel(M))),r,c)
end
commands entered in matlab window:
make a matrix to test the function
>>mat=[4 5 2;1 3 6;7 8 4;9 1 5]
mat=
4 5 2
1 3 6
7 8 4
9 1 5
In command window call the function by typing the appropriate call format
>>matsort(mat)
1 4 6
1 4 7
2 5 8
3 5 9
Thus the functions arranges the elements in ascending order column wise