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POEuler's Method Python Variable Input Type
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16578419
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2013-05-16T03:15:44.513
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2013-05-16T20:18:21.020
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2013-05-16T04:03:10.760
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Body
I'm having an issue with the following code. It's currently in progress but a large problem that I'm running into is that my input of a function returns an error no matter what type of input I have tried. It either returns with an issue with the error type, or an issue of x not being defined if I enter a function such as x. <pre><code>f = raw_input("Please enter function: y' = ") x0 = float(raw_input("Please enter the initial x value: ")) y0 = float(raw_input("Please enter the initial y value: ")) xmax = float(raw_input("Please enter the value of x at which to approximate the solution: ")) h = float(raw_input("Please enter the step size: ")) showall = int(raw_input("Would you like to see all steps (1) or only the approximate solution (2)? ")) def f(x,y): value = f return (value) def euler(x0,y0,h,xmax): x=x0; y=y0; xd=[x0]; yd=[y0]; while x<xmax: y = y + h*f(x,y) yd.append(y) x=x+h xd.append(x) return(xd,yd) (xvals,yvals) = euler(x0,y0,h,xmax) if showall == 1: print "" print "x_n y_n" for uv in zip(xvals, yvals): print uv[0],uv[1] elif showall == 2: print "" print "x_n y_n" print xvals, yvals else: print "" print "There has been an error with your choice of what to see; showing all steps." print "" print "x_n y_n" for uv in zip(xvals, yvals): print uv[0],uv[1] print " " plotask = int(raw_input("Would you like to see a plot of the data? Yes (1); No (2) ")) if plotask == 1: print "1" elif plotask == 2: pass else: print "" print "Could not understand answer; showing plot." </code></pre> Any help would be appreciated. The error and trace is the following: <pre><code> File "C:\Users\Daniel\Desktop\euler.py", line 25, in <module> (xvals,yvals) = euler(x0,y0,h,xmax) File "C:\Users\Daniel\Desktop\euler.py", line 19, in euler y = y + h*f(x,y) TypeError: unsupported operand type(s) for *: 'float' and 'function' </code></pre>
Tags
<python><variables><input>
Title
Euler's Method Python Variable Input Type
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PostAcceptedAnswerId
1. PO
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1. USDavid Z
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1. USdanielunderwood
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1. PO
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