Creating a function for a two-dimensional array

Question

amateurintraining 2017-10-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/361120-creating-a-function-for-a-two-dimensional-array

回答： Walter Roberson 2017-10-13

I have a function:

function [ filled ] = travelDistance( blank )
%TRAVELDISTANCE
%   blank: two-dimensional array comprised of -1s, 0s, and 1s
%   filled: blank that is modified (replace every 0 in blank with its
%   distance to the nearest 1, tarting at 2, traveling along cardinal
%   directions without passing through a -1 value)
    function d = xyspace(A,x,y)
        idx1=find(ismember(A,x));
        idx2=find(ismember(A,y));
        x=union(idx1,idx2);
        whichset=ismember(x,idx1)+2*ismember(x,idx2);
        idx=diff(whichset)>0;
        d=x([false,idx])-x([idx,false]);
    end
filled=xyspace(blank,0,1);
end

but this function doesn't work on two-dimensional arrays and receives an error:

Error using horzcat
Dimensions of matrices being concatenated are
not consistent.
Error in travelDistance/xyspace (line 14)
      d=x([false,idx])-x([idx,false]);
Error in travelDistance (line 17)
filled=xyspace(blank,0,1);