i created function works on 3*3 matrix how i make it work on 9*9 mat with loop?

hey guys,i created function works on 3*3 matrix how i make it work on 9*9 mat with loop?

[madhan ravi]

show your function

[ali egbarie]

function n=checkunit(a)
%the function check if there number showing 2 times in matrix if true n=1,false=0
[m,n]=size(a);
n=1;
for i=1:m*n
    if (find(a==a(i))~=1)
        n=0;
        break;
    end
end

[Andrea Monfredini]

what is v ?

[Rik]

Your function doesn't work yet. It requires the variable v. With any variable v it will not do what the comment line describes.

Also, should your output be a 3x3 matrix (with one element for each subgroup of 3x3), or should it be extended to work for larger matrices and still return a true/false?

[ali egbarie]

v should be a

[ali egbarie]

the output should be extended to work for larger matrices and still return a true/false

Answer 1

[Rik]

This should work better:

function tf=checkunit(a,tol)
%Check matrix for unique values
%This function returns true when no duplicates are found (within a default
%tolerance of 10^-6)
if nargin==1,tol=10^-6;end
unique_vals=uniquetol(a,tol, 'DataScale', 1);
%If there are no duplicate values, the number of unique values is equal to
%the number of values in the original matrix.
tf= numel(a)~=numel(unique_vals);
end

One of the problems is that you overwrote n with 1 just before you attempted to use it to determine how many iterations to test.

If you insist on using a for loop, you could try something like this:

function n=checkunit(a)
%the function check if there number showing 2 times in matrix if true n=1,false=0
n=1;
for ii=1:numel(a)
    if (find(a==a(ii))~=1)
        n=0;
        break;
    end
end

[Rik]

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