MATLAB: Condition for including difference between nan

isnan

Hi Guys, I had the following line for a condition I needed.

if (abs((tempBeforeDelam(i,j,1)-tempBeforeDelam(i,j,2)))< 1 ...
 && abs((tempBeforeDelam(i,j,2)-tempBeforeDelam(i,j,3))) < 1 ...
 && abs((tempBeforeDelam(i,j,3)-tempBeforeDelam(i,j,4))) < 1 ...
 && abs((tempBeforeDelam(i,j,4)-tempBeforeDelam(i,j,5))) < 1 ...
 && abs((tempBeforeDelam(i,j,5)-tempBeforeDelam(i,j,1))) < 1)

and replaced it with

 if all( abs( diff([ squeeze(tempBeforeDelam(i,j,:)); tempBeforeDelam(i,j,1) ]) ) < 1)

now I also need to incorporate a condition that says that even if the difference is nan proceed to the next step.

Any help would be appreciated.

Thanks

Best Answer

somediff = diff([squeeze(tempBeforeDelam(i,j,:)); tempBeforeDelam(i,j,1)]);
if all(abs(somediff) < 1 | isnan(somediff))
  %do it
end

The only way of returning true in a comparision expression that contains NaN is to explicitly test it with isnan. NaN is never smaller than, greater than or equal to any number (or another NaN).

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nanmedian(tempBeforeDelam(i,j,k),3) with fixed i, j, k, is taking nanmedian() of a scalar. It doesn't matter which dimension is used, the result is going to be the scalar.

nanmedian(tempBeforeDelam(i,j,1:5),3) should work for the third dimension.

For nanmedian to be useful on any particular dimension, there must be multiple elements along that dimension. For example,

nanmedian(tempBeforeDelam(i,:,k),2)

MATLAB: Can anyone help me to run this code , thank you

for i=1:300
    for j=1:100
        A{i,j}=10*randn(2,8);
        B{i,j}=10*randn(2,8);
        MA{i,j}=mean(A{i,j},1);
        MB{i,j}=mean(B{i,j},1);
        [E{i,j}, idx{i,j}] = min([MA{i,j};MB{i,j}]); 
        AB{i,j} = nan(2, length(E{i,j})); 
        AB{i,j}(:,idx{i,j}==1) = A{i,j}(:,idx{i,j}==1); 
        AB{i,j}(:,idx{i,j}==2) = B{i,j}(:,idx{i,j}==2);
    end
end

Best Answer

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MATLAB: Finding median along the third dimension of a 3d array

MATLAB: Can anyone help me to run this code , thank you

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