Multi-Platform Graphics Programming with Kivy by Moisés Cywiak & David Cywiak

Author:Moisés Cywiak & David Cywiak
Language: eng
Format: epub
ISBN: 9781484271131
Publisher: Apress

(11.1)

The code in Listing 11-4 splits the symbolic expression into several lines, making the code simpler.def f():

N1=100/(5*x**2+3*x+2);

N2=(75*x**3+2*x**2+3);

N3=(50*x-3)/(12*x+5)

return N1*N2*N3;

Q=f();

Listing 11-4Splitting a Symbolic Expression Into Several Code Lines

If we now use the print (Q) directive, we obtain the following:100*(50*x - 3)*(75*x**3 + 2*x**2 + 3)/((12*x + 5)*(5*x**2 + 3*x + 2))

From this result, we can see that Q symbolically represents our algebraic expression. We can obtain the corresponding numerical formula by using the sp.lambdify( Q) directive . The complete code is shown in Listing 11-5.import sympy as sp

x=sp.symbols("x");

def f():

N1=100/(5*x**2+3*x+2);

N2=(75*x**3+2*x**2+3);

N3=(50*x-3)/(12*x+5)

return N1*N2*N3;

Q=f();

R=sp.lambdify(x,Q);

print( R(-2) ); # Calculate the function at x=-2

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