14.+surface+plotting.pdf

# 14.+surface+plotting.pdf - TA Mahalakshmi Srinivasan...

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TA: Mahalakshmi Srinivasan 1 HELP SURFACE PLOTTING Creating a 3D Object So far we’ve talked about plotting lines and shapes. Now we’re moving on to plotting surfaces. The first step to creating a surface is basically creating a grid of x and y values and then raising or lowering them (specifying a z value). We create a grid and then write a function defining z and plot x, y, and z. To create a grid, we use the function meshgrid(). The function takes in 2 vectors (x and y) and produces a grid that represents every possible combination of the two. For example: [xx yy] = meshgrid([1 2 3], [4 5 6 7]) xx ==> [1 2 3; 1 2 3; 1 2 3; 1 2 3] yy ==> [4 4 4; 5 5 5; 6 6 6; 7 7 7] Some things to note are that in xx each of the rows are identical and in yy each of the columns are identical. Also, x had a length of 3 and y had a length of 4 so the two arrays xx and yy are 4 x 3. We can then raise and lower them by specifying a function for zz.

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• Fall '08
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• xx yy zz, Mahalakshmi Srinivasan

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