plot 2 variables of different length

x = 100:400 ;

y = 600:1500 ;

Z = 3*x+2*y ;

I want to plot z (along z axis) as a function of x (along x axis) and y (along y axis).

[dpb]

doc meshgrid
doc mesh
doc surf

Answer 1

[Image Analyst]

Try meshgrid():

x = 100:400 ;
y = 600:1500 ;
[X, Y] = meshgrid(x, y);
Z = 3 * X + 2 * Y;
surf(X, Y, Z, 'EdgeColor', 'none');
fontSize = 15;
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
zlabel('Z', 'FontSize', fontSize);
title('Z = 3 * X + 2 * Y', 'FontSize', fontSize);
colormap(jet(256));
colorbar;

[priya]

thank you

[priya]

For the above case, if i need to plot a function,

P=X/Z;

what should be the command?

[Image Analyst]

x = 100:400 ;
y = 600:1500 ;
[X, Y] = meshgrid(x, y);
Z = 3 * X + 2 * Y;

subplot(1, 2, 1);
surf(X, Y, Z, 'EdgeColor', 'none');
fontSize = 15;
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
zlabel('Z', 'FontSize', fontSize);
title('Z = 3 * X + 2 * Y', 'FontSize', fontSize);
colormap(jet(256));
colorbar;

P = X ./ Z;
subplot(1, 2, 2);
imshow(P, [], 'XData', x, 'YData', y);
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
zlabel('Z', 'FontSize', fontSize);
axis('on', 'xy');
title('P = X ./ Z', 'FontSize', fontSize);
colorbar;
impixelinfo;
g = gcf;
g.WindowState = 'maximized'

[priya]

In this figure, how can i plot the minimum value of Z on the X axis, for every value of Y?

[Image Analyst]

minYValues = min(Z, [], 2);
minXValues = min(Z, [], 1);

[priya]

How to plot minYValues on the surface plot?

[Image Analyst]

I show you the image on the right. Can you show me exactly what you'd expect your surface plot to look like if I did what you are asking?