Plotting a Matrix within an X,Y range

[Link-]

Hi guys...

Here's the problem. I want to plot a Temperature T(x,y) profile across a plate with dimensions L x W. I'm using finite difference method so the temperature are only known at the nodes I choose, if I make n nodes across the Length and m nodes across the Width I will end up with an n x m matrix or n*m x 1 matrix. The problem is that I want to assign each known Temperature of the nodes to its respect point in the plate across the x-y plane.

Is not a plotting command problem, I used surf(T) or mesh(T) and I end up with a plot that have the temperature profile but the x-axis goes from 0 to n and the y from 0 to m and not LxW. The temperature is not in it's corresponding x,y point.

Any help?
Thanks in advance.

 

[chroot]

You need to learn to read the documentation. From MATLAB's help:

mesh(X,Y,Z) draws a wireframe mesh with color determined by Z so color is proportional to surface height. If X and Y are vectors, length(X) = n and length(Y) = m, where [m,n] = size(Z). In this case, (X(j), Y(i), Z(i,j)) are the intersections of the wireframe grid lines; X and Y correspond to the columns and rows of Z, respectively. If X and Y are matrices, (X(i,j), Y(i,j), Z(i,j)) are the intersections of the wireframe grid lines.

- Warren

 

[quicknote]

I understand your problem and can offer some suggestions to help you plot your matrix within an X,Y range. One option is to use the meshgrid function in MATLAB to create a grid of coordinates that correspond to your desired X,Y range. This will allow you to plot your temperature values at their respective X,Y points on the grid. Another option is to use the pcolor function in MATLAB, which creates a pseudocolor plot and allows you to specify the X,Y coordinates for each data point. Additionally, you may want to consider using a different plotting function that allows you to specify the X,Y coordinates, such as scatter or scatter3. I hope these suggestions help and good luck with your research!