how to create 3D plot from a csv or excel


I am a beginner using matplotlib. Can you help me to solve below questions:

I want to create a 3D plot from a csv file or excel file.

The x axis is ?time?

The y axis is ?RB??from RB0 to RB49?

The z axis is ?value?

When using matplotlib, I meet to problems:1, the x, y axis is not value, they are text.
2, The z value is not a formula?but corresponding to the table.

I cannot found answers from the web, so could any body give me some support.

Ramond Yuan
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