MatLab - 通过 X 和 Y 循环计算 Z

Question

我正在尝试遍历一些对数空间来计算 Z 值并创建等高线图。但我被困住了。现在我有了 Z 值，如何创建等高线图？我怎样才能设置我的 Z 变量？我对 Z 的计算是基于图像的，我无法以其他方式进行。

X = logspace(-10,0,10);
Y = logspace(-10,0,10);
for x = X
    for y = Y
        % here should some magic happen... but you have to assign real positive integers as indices for z
        z(x, y) = 1; % some other heavy calculation
    end
end

% what should I do here?
contourf(x, y, z); % does not work unfortunately

Answer 1

这行得通吗？

X = logspace(-10,0,10);
Y = logspace(-10,0,10);
for x = 1:numel(X)
    for y = 1:numel(Y)
        %// Note the reversed y,x - this is because the x-axis in an image / chart is usually mapped to the horizontal axis which is the columns whereas matrix representations would have dimension one as the rows. Hence you need to put x in dimension 2 and y in dimension 1
        z(y,x) = 1; %// i.e. z(y,x) = f(X(x), Y(y))
    end
end

contourf(X, Y, z);