December 2017
Intermediate to advanced
386 pages
10h 42m
English
Content preview from SciPy Recipes
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How to do it...
Let's now define the expression for the function we want to compute by running the following code in a Jupyter cell:
r, theta = symbols('r, theta')x = r * cos(theta)y = r * sin(theta)x, y
In the first line in this code, we define the symbols r and theta. A symbol in sympy is used to represent the name of a mathematical variable.
Next, with the x = r * cos(theta) and y = r * sin(theta) assignments, we define two sympy expressions, x and y.
Notice that the sin() and cos() functions that appear here are defined in sympy and are not the same as the np.sin() function and np.cos() from NumPy!
The last line in the cell, x,y, will print the x and y expressions in pretty format, according to the usual rules for typesetting mathematics. ...
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