how to plot contour function

I want to plot a contour plot of temperatuer T, where T=x*e^y (T has x and y components)

range -50<=x<=50, 0<=y<=100

I followed the guide by matlab of plotting contour plot

(This plot was most visible)

x=linspace(-50,50);
y=linspace(0,100);
[X,Y]=meshgrid(x,y);
z=X.*exp(Y)
contour(x,y,z)

however, the given range for x and y gave me a very weired looking graph.

Hence, I change the range to make it visible

x=linspace(-5,5);
y=linspace(0,1);
[X,Y]=meshgrid(x,y);
z=X.*exp(Y)
contour(x,y,z)

Is there any mistake in first code?

Answer 1

[Voss]

x = 0:10;
y = 0:0.2:2;
[X,Y] = meshgrid(x,y);
T = X.*exp(Y);
contour(X,Y,T) % using matrices X, Y
% contour(x,y,T) % same result, using vectors x, y
colorbar

[Jong Hyun Lee]

Thank you for the answer, is there any options that I can display a plot into gradation form by using contour function? not lines?

Like this?

[Walter Roberson]

x = 0:10;
y = 0:0.2:2;
[X,Y] = meshgrid(x,y);
T = X.*exp(Y);
contourf(X,Y,T, 20) % using matrices X, Y
% contour(x,y,T) % same result, using vectors x, y
colorbar

Answer 2

[Walter Roberson]

xvec = linspace(0, 5, 25);
yvec = linspace(-3, 3, 25);
[X, Y] = meshgrid(xvec, yvec);
T = X .* exp(Y);

surf(X, Y, T, 'edgecolor', 'none')