Could anyone help me how to solve the following issue with respect to the following code

code:

a= [4.7908    5.0104    5.1329    5.3186    5.3094    5.3070    5.4452     5.5001;
    0.0958    0.0994         0         0    0.1848    0.2020    0.1851    0.2146;
    0.0848         0    0.1469    0.1859    0.1767    0.1854    0.1856    0.1648;
         0         0         0         0         0         0         0         0;
         0    0.0896    0.1619    0.1351         0         0         0         0;
         0         0         0         0         0         0         0         0]
for i=1:size(a,2)
b=a(:,1:i)
iwant =  reshape(b(randperm(numel(b))),size(b))
end

with respect to the code in for loop,

when the loop runs for the first time it takes the first column and reshape it and

when the loop runs for the second time it takes the first and second column and reshapes it.

But what i actually need is when the loop runs for the first time by taking the first column,reshape it ,should not be changed when the loop runs for the second time by taking the second column.

Could anyone please help me on it.

Answer 1

[KSSV]

a=[ 4.7908    5.0104    5.1329    5.3186    5.3094    5.3070    5.4452    5.5001;
    0.0958    0.0994         0         0    0.1848    0.2020    0.1851    0.2146;
    0.0848         0    0.1469    0.1859    0.1767    0.1854    0.1856    0.1648;
    0         0         0         0         0         0         0         0;
    0    0.0896    0.1619    0.1351         0         0         0         0;
    0         0         0         0         0         0         0         0]   ;


[m,n] = size(a) ; 
b = a ; 
for i = 1:m
    idx = randperm(n) ; 
    b(i,:) = a(i,idx) ;
end
    

[jaah navi]

ok.But what i actually need is i need to interchage the elements place present in the first column with respect to first colum itself,second column with respect to second column itself and so on.Even after interchanging each column can contain the three values but in different place with respect to first column.The same scenario should happen for all the rest of columns.

could you please help me on this.

[KSSV]

[m,n] = size(a) ; 
b = a ; 
idx = randperm(n) ; 
for i = 1:m    
    b(i,:) = a(i,idx) ;
end

[jaah navi]

but first column elements are not getting interchaged among itself.

[jaah navi]

when i run the code the output remains equal to input.

[KSSV]

No it will not....