八度函数应该返回一个向量,而不是'ans'

Question

我试图了解如何在Octave函数中返回值.我写了一个函数,它返回多个变量,即[error, accuracy, precision, npv, recall, F1_score].

我正在尝试实现的是将每个 结果变量返回到控制台而不是标准ans(它似乎总是第一个变量).

所以这很好用:

>> [error, accuracy, precision, npv, recall, F1_score] = describeConfMatrix([546, 0;314, 0])
error =  0.36512
accuracy =  0.63488
precision =  0.63488
npv = NA
recall =  1
F1_score =  0.77667

但这会产生'ans':

>> z = describeConfMatrix([546, 0;314, 0])
z =  0.36512
>> describeConfMatrix([546, 0;314, 0])
ans =  0.36512

虽然我希望看到整个返回变量列表.

我也想让这个工作(断言用于测试函数):

m = [546, 0;314, 0];
ans = [0.36512, 0.63488, 0.63488, NA, 1, 0.77667];
assert(isequal(describeConfMatrix(m),ans))

非常感谢Matlab新手!

这是我的代码:

function [error, accuracy, precision, npv, recall, F1_score] = describeConfMatrix(m)
  TP = m(1,1);
  FN = m(1,2);
  FP = m(2,1);
  TN = m(2,2);
  K = TP + FN + FP + TN;
  error = (FP + FN) / K;
  accuracy = (TP + TN) / K;
  precision = TP / (TP + FP); # sometimes called 'positive predictive value'
  recall = TP / (TP + FN);
  if (FN + TN) != 0
    npv = TN / (FN + TN);
  else
    npv = NA;
  end;
  F1_score = (2*precision*recall)/(precision + recall);
end

Answer 1

• 如果没有为函数调用指定输出参数(例如describeConfMatrix([546, 0;314, 0])),它将仅返回第一个输出变量ans.
• 如果只指定一个变量,它也将返回第一个输出变量(z = describeConfMatrix([546, 0;314, 0])).
• 如果要返回所有变量,则必须在函数调用中指定它们,如 [error, accuracy, precision, npv, recall, F1_score] = describeConfMatrix([546, 0;314, 0])

这是MATLAB/Octave中的正常和预期行为.assert由于同样的原因,您的生产线无法使用.