Plotter troubles

[hondros]

Hello everyone, my latest project is this:
1) Ask user to input a function
2) Plot said function
Well, I figured out how to strip the function into two parts, input a number, and evaluate the function. That all works fine outside of a defined function I created. The trouble I have, is now when asking for user input, it screws it up. I can't really explain it, but it looks like the results are just repeats of a few numbers. Here's my code:

from numpy import *
from pylab import *

numpyfunctions = [
    'abs',
    'absolute',
    'angle',
    'sqrt',
    'log',
    'sin',
    'sinh',
    'cos',
    'cosh',
    'tan',
    'tanh']

def frange(start, end=None, inc=None):
    "A range function, that does accept float increments..."

    if end == None:
        end = start + 0.0
        start = 0.0

    if inc == None:
        inc = 1.0

    L = []
    while 1:
        next = start + len(L) * inc
        if inc > 0 and next >= end:
            break
        elif inc < 0 and next <= end:
            break
        L.append(next)
        
    return L

def funeval(function, numbers=range(-5, 5), splitat='x'):
    '''Takes the function (string) and runs through a list of numbers,
       then return a list of numbers that equals the function'''
    # List of the function's results
    result = []
    for number in numbers:
        # Usually not a good idea to divide anything by zero :D
        if number != 0:
            # Split the function input
    	    # Usually at 'x'
            # Then, we put together the number
            # inside the function in replace
            # of the 'x'
            b = function.split(splitat)
            c = ''
            for y in b:
            	c += y
            	if y != b[-1]:
            		c+= '%d' %(number)
            result.append(eval(c))
        if number == 0:
           result.append(0)
    return result

def menu():
    print("Function Plotter v1.0")
    print("~Hondros")
    print("Type in a function, or type 'help' for function commands")
    print("Type frange(x, y) for a specific x range)")
    print("example: 2*sin(x)")
    print("")
    #ran = frange(-5, 5, 0.01)
    while True:
        try:
            f = raw_input("y = ")
            if f == 'help':
                menuhelp()
            if f[0:6] == 'frange':
                ran = eval(f)
            else:
                y = funeval(f, ran)
                #plot(ran, y)
                #show()
        except:
            print("The function %s is invalid" %(f))

menu()

Any thoughts? If needed, please look at attached .txt file. That's the output I have when I first tried creating this.

[hondros]

Okay, I redid the code, and it's all working now. Don't know what the issue was, but this version works a LOT better. However, I have a new issue. This time, it won't do anything except the "else" clause. Any ideas?

from numpy import *
from pylab import *

def frange(start, end=None, inc=None):
    "A range function, that does accept float increments..."

    if end == None:
        end = start + 0.0
        start = 0.0

    if inc == None:
        inc = 1.0

    L = []
    while 1:
        next = start + len(L) * inc
        if inc > 0 and next >= end:
            break
        elif inc < 0 and next <= end:
            break
        L.append(next)
        
    return L

def funceval(function, numlist=frange(-100, 100, 0.01), splitat='x'):
    y = []
    for x in numlist:
        try:
            c = '%s%s%s'%(function.split(splitat)[0], str(x), function.split(splitat)[1])
            y.append(eval(c))
        except:
            numlist.pop(numlist.index(x))
    return y

def ranradians(ran):
    a = []
    for x in ran:
        a.append(radians(x))
    return a

def menu():
    print("Function Plotter v2.0")
    print("~Hondros")
    print("Type in a function, or type 'help' for function commands")
    print("Type frange(x, y) for a specific x range)")
    print("Type set(radian) to convert list of numbers to radians (for sin)")
    print("Type show to show the plot window")
    print("example: 2*sin(x)")
    print("")
    while True:
        try:
            ran = frange(-100, 100, 0.01)
            f = raw_input("y = ")
            if f == 'help':
                menuhelp()
            if f[0:6] == 'frange':
                ran = eval(f)
            if f == 'set(radian)':
                ran = ranradians(ran)
            if f == 'show':
                show()
            else:
                y = funceval(f, ran)
                plot(ran, y)
        except:
            print("The function %s is invalid" %(f))

#menu()

[fallopiano]

I don't have numpy, but try replacing all of the other 'ifs' with 'elif' and see if that works.

[hondros]

Okay, fixed it. Again, don't know what the issue is. Anyways, if anyone wants the finished code, here it is:
(note that numpy and pylab are required)

from numpy import *
from pylab import *

def frange(start, end=None, inc=None):
    "A range function, that does accept float increments..."

    if end == None:
        end = start + 0.0
        start = 0.0

    if inc == None:
        inc = 1.0

    L = []
    while 1:
        next = start + len(L) * inc
        if inc > 0 and next >= end:
            break
        elif inc < 0 and next <= end:
            break
        L.append(next)
        
    return L

def funceval(function, numlist=frange(-100, 100, 0.01), splitat='x'):
    y = []
    for x in numlist:
        try:
            numfunction = ''
            for c in function.split(splitat)[:-1]:
                numfunction += c
                numfunction += '(%f)' %(x)
            numfunction += function.split(splitat)[-1]
            y.append(eval(numfunction))
        except:
            numlist.pop(numlist.index(x))
    return y

def ranradians(ran):
    a = []
    for x in ran:
        a.append(radians(x))
    return a

def menuhelp():
    print("Function Plotter v2.0")
    print("Help")
    print("")
    print("Functions can be in any form, so long as there is an 'x'")
    print("Standard form for parabola's typing in the function is:")
    print("A*(x**2)+B*x+C")
    print("Carry this form to any function")
    print("Make sure to type in every symbol, none are implied")
    print("Pi is: pi")
    print("Using sine or similar functions: sin(x)")
    print("""Functions usable are:
'abs'
'absolute'
'angle'
'sqrt'
'log'
'sin'
'sinh'
'cos'
'cosh'
'tan'
'tanh'
""")
    print("For further help, please look at the source code to figure it out,")
    print("Or, e-mail me at: [e-mail]")

def menu(ran=frange(-100, 100, 0.01), once=False):
    if once != True:
        print("Function Plotter v2.0")
        print("~Hondros")
        print("Type in a function, or type 'help' for function commands")
        print("Type frange(x, y) for a specific x range)")
        print("Type set(radian) to convert list of numbers to radians (for sin)")
        print("Type show() to show the plot window")
        print("example: 2*sin(x)")
        print("")
    while True:
        try:
            f = raw_input("y = ")
            if f == 'help':
                menuhelp()
            if f[0:6] == 'frange':
                menu(eval(f), True)
            if f == 'set(radian)':
                menu(ranradians(ran), True)
            if f == 'show':
                show()
            else:
                y = funceval(f, ran)
                plot(ran, y)
        except:
            print("The function %s is invalid" %(f))

menu()