如何从 MATLAB 表中删除 NaN?

Question

我在评估语义分割网络时得到NaN值。如何将NaN替换为0？

metrics = 
semanticSegmentationMetrics with properties:
ConfusionMatrix: [9×9 table]
NormalizedConfusionMatrix: [9×9 table]
DataSetMetrics: [1×5 table]
ClassMetrics: [9×3 table]
ImageMetrics: [5×5 table]
metrics.ClassMetrics
ans =
9×3 table
Accuracy      IoU      MeanBFScore
________    _______    ___________
Fat                  0           0            0  
Intestine          NaN           0          NaN

Answer 1

A = rand(4);  % Get random matrix
A(A>0.9) = nan; % Set some points to NaN
A
A =
0.0596    0.5216    0.7224       NaN
0.6820    0.0967    0.1499    0.6490
0.0424    0.8181    0.6596    0.8003
0.0714    0.8175    0.5186    0.4538
A(isnan(A)) = 0  % Get NaN values, set to 0
A =
0.0596    0.5216    0.7224         0
0.6820    0.0967    0.1499    0.6490
0.0424    0.8181    0.6596    0.8003
0.0714    0.8175    0.5186    0.4538

您可以使用isnan.这将创建一个逻辑掩码，您可以使用该掩码索引回原始元素，并且可以将所有相应的元素设置为所需的数字(在本例中为0(。

因为tablesismissing似乎是isnan的可行替代方案;语法完全相同(A(ismissing(A)) = 0(。