使用逻辑数组索引到矩阵

使用

A = magic(4);A(3,3)=nan;
threshold=1;

for ii = 1:size(A,1) % loop over rows
    if sum(isnan(A(ii,:)))>=threshold % get the nans, sum the occurances
        A(ii,:)=nan(1,size(A,2)); % fill the row with column width amount of nans
    end
end

结果是

A =

    16     2     3    13
     5    11    10     8
   NaN   NaN   NaN   NaN
     4    14    15     1

或者,正如@Obchardon在评论中提到的那样,你可以进行矢量化:

A(sum(isnan(A),2)>=threshold,:) = NaN

A =

    16     2     3    13
     5    11    10     8
   NaN   NaN   NaN   NaN
     4    14    15     1

作为旁注,您可以轻松地将其更改为列,只需为其他维度执行所有索引:

A(:,sum(isnan(A),1)>=threshold) = NaN;