PythonQ 240-8XX Manuale Utente Scaricare il pdf (Pagina 31)

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Example: plot a function given on the command line

Ta s k : p l o t ( e. g . ) f(x)=e

−0.2x

sin(2πx) for x ∈ [0, 4π]

Specify f(x) and x interval as text on the command line:

Unix/DOS> python plotf.py "exp(-0.2

sin(2

x)" 0 4

Program:

from scitools.all import

formula = sys.argv[1]

xmin = eval(sys.argv[2])

xmax = eval(sys.argv[3])

x=linspace(xmin,xmax,101)

y=eval(formula)

plot(x, y, title=formula)

Thanks to eval,input(text)withcorrectPythonsyntaxcanbe

turned to running code on the ﬂy

Numerical Python – p. 265/728

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PythonQ 240-8XX Manuale Utente Pagina 31