'numpy.ndarray'：对象不可调用错误

Question

I am trying to visualize Logistic Regression on the training data set and here's the snippet of code when running encounters ('numpy.ndarray' object is not callable) error.

How to fix this?

for i,j in enumerate(np.unique(Y_set)): plt.scatter(X_set(Y_set == j,0), X_set(Y_set == j, 1), c=ListedColormap(('red','green'))(i),label = j)

Answer 1

Welcome to SO. It's hard to see where the error is because we have no idea what X_set and Y_set are... but I'm going to guess they are numpy.ndarrays. If they are, the error is how you are referring to them in the scatter call. You should use square brackets to index into your sets instead of the parentheses (which try to 'call' the object like a function).

for i,j in enumerate(np.unique(Y_set)):
    plt.scatter(X_set[Y_set == j,0], X_set[Y_set == j, 1],
                c=ListedColormap(('red','green'))(i),label = j)

Answer 2

尝试使用方括号来索引您的集合，这可能会起作用。

 plt.scatter(X_set[Y_set == j,0], X_set[Y_set == j, 1],