Output showing used cells?

Question

Robert 2014-12-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/166091-output-showing-used-cells

回答： Geoff Hayes 2014-12-10

I have a condition in my code basically stating only use rows with data in each cell (if there is a NAN, don't use that row). It work fine, but I want it to generate some sort of list to tell me which rows it has used, e.g. if the data looked like

2 3 5
4 NAN 8
5 6 7

I need something like

True
False
True

Here is the part of my code that is relevant, what should I add?

% screen the data over all pixels to select the ones with good data for
% regression analysis
 [rows, cols]=size(Amp);
    data=zeros(1, 9); % Amp, PET, P, AI, NDVI, ELE, SLOPE, FLOWACCU, SPI 
    dip=0;
    for i=1:rows
        for j=1:cols
            camp=Amp(i,j);
            cpet=PET(i,j);
            cp=P(i,j);
            cai=AI(i,j);
            cndvi=NDVI(i,j);
            cele=ELE(i,j);
            cslope=SLOPE(i,j);
            cflow=FLOW(i,j);
            cspi=SPI(i,j);
            if  isnan(camp)==0 && isnan(cpet)==0 && isnan(cp)==0 && isnan(cai)==0 && isnan(cndvi)==0 && isnan(cele)==0 && isnan(cslope)==0 && isnan(cflow)==0 && isnan(cspi)==0  
                dip=dip+1;
                data(dip,:)=[camp, cpet, cp, cai, cndvi, cele, cslope, cflow, cspi]
            end
        end
    end

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Answer 1

Geoff Hayes 2014-12-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/166091-output-showing-used-cells#answer_161878

在 MATLAB Online 中打开

Robert - create a logical matrix outside of the for loop and update it at each iteration according to whether there is a NaN in the column (for that row) or not. Something like

 % screen the data over all pixels to select the ones with good data for
 % regression analysis
 [rows, cols]=size(Amp);
 data=zeros(1, 9); % Amp, PET, P, AI, NDVI, ELE, SLOPE, FLOWACCU, SPI 
 dip=0;
 isNanFree = logical(zeros(rows,cols));
 for i=1:rows
     for j=1:cols
     % etc.
     if  isnan(camp)==0 && ...
         isNanFree(i,j) = true;
         % etc.
     end
 end