nested for loops conditions

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O Nawwar
O Nawwar 2018-3-21
回答： ttopal 2018-3-21
Hello, I am trying to create a periodic mesh in x and y. So I loop the rows using i and loop columns using j. I want to omit rows -3, -2, 0, and 8. I want to omit the column number 3. I am using the following lines:
for (i=-n_row/2:n_row/2)
for (j=-n_col/2:n_col/2)
if ((i!=-3) and (i!=-2) and (i!=0) and (i!=8) )
do my function;
end
end
end
These statements omit the rows efficiently. But I do not know how to omit the column. Any help??

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回答（1 个）

ttopal
ttopal 2018-3-21
You are actually not using matlab syntax. And if you are comparing a value to list of values ( like i and -3,-2,0,8) you might want to use a function for that.
for i=-n:n
for j=-m:m
if (~ismember(i,[-3,-2,0,8]) && j~=0)
do my function
end
end
end

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