MatLab - 循环通过X和Y来计算Z

Question

我想循环通过一些日志空间来计算Z值并创建一个轮廓图。但我被卡住了。我现在如何创建等值线图，我有我的Z值？我怎样才能设置我的Z变量？我对Z的计算是基于图像的，而我不能用其他方式来完成。

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

这是行得通吗？

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);