Waléria,
I repeat, you need to add parentheses for the denominator of that quantity
in order to match what you wrote out on paper. You are missing a set of
parentheses that is causing (3e14**2) to be *multiplied* rather than
divided. This explains the huge values you are getting.
Ben Root
On Tue, Jun 8, 2010 at 2:05 PM, Waléria Antunes David <
waleriantu...@gmail.com> wrote:
> no, I think, did not understand my functions.....see....i made a change my
> second function in the attached.
>
>
> On Tue, Jun 8, 2010 at 3:48 PM, Benjamin Root <ben.r...@ou.edu> wrote:
>
>> I think I found your errors.
>>
>> First, you are correct, the scientific notation in python is as you
>> understand, there is nothing wrong with that.
>>
>> Instead, you have a problem with order of operations. In the last
>> quantity, you have "((x**2)/4*(1e4**2)*(3e14**2))"
>> According to the equation that you wrote out in the attached image, you
>> need: "((x**2)/*(*4*(*2*e4**2)*(3e14**2))*)*"
>> Note that you needed parentheses for the entire denominator. Also, the
>> 1e4**2 should have been 2e4**2.
>>
>> This gives me values between 4.3125e-48 and 5.5359e-48.
>>
>> Ben Root
>>
>> On Tue, Jun 8, 2010 at 12:47 PM, Waléria Antunes David <
>> waleriantu...@gmail.com> wrote:
>>
>>> I understand what you are saying, but my functions are these, attached.
>>>
>>>
>>>
>>>
>>>
>>>
>>> Scientific notation in Python is not so?
>>>
>>> *Math * *Python*
>>>
>>>
>>>
>>>
>>>
>>>
>>> Pinc = 10-6 Pinc = 1e-6
>>>
>>> 3,0x1014 3e14
>>>
>>>
>>>
>>>
>>>
>>> ?
>>>
>>>
>>> Then, changing my functions of the images attached for python is as bellow:
>>>
>>>
>>>
>>>
>>>
>>>
>>> y1 = -108*(x**2)/(3e14**2)
>>>
>>> y2 = 1*((1.38e-23*(1e0+4)/1e-6)*((x**2)/4*(1e4**2)*(3e14**2))))
>>>
>>> Is not it?
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Tue, Jun 8, 2010 at 1:34 PM, Gökhan Sever <gokhanse...@gmail.com>wrote:
>>>
>>>>
>>>>
>>>> On Tue, Jun 8, 2010 at 10:19 AM, Waléria Antunes David <
>>>> waleriantu...@gmail.com> wrote:
>>>>
>>>>> Hello!!!
>>>>>
>>>>> My name is Waleria. I work at INPE in Sao Jose dos Campos, Brazil. And
>>>>> I'd like to make a question. I'm in trouble to generate a two functions
>>>>> graph.
>>>>>
>>>>> I have a problem to generate a graph of the two functions. I have this
>>>>> functions, is bellow:
>>>>>
>>>>> *y1 = -108*(x**2)/(3e14**2)*
>>>>>
>>>>> *y2 = 1*((1.38e-23*(1e0+4)/1e-6)*((x**2)/4*(1e4**2)*(3e14**2))))*
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> You might need to check your y2. You are mixing integers and floats
>>>> which possible have resulted with some rounding errors. I get e+30 when I
>>>> assert the terms as floats in y2.
>>>>
>>>> For the plotting: y1 is around -e-20 whereas y2 goes up to e+30. You
>>>> can't see the trend easily on one axes even if you could scale
>>>> them logarithmically (hint logarithm is only defined for positive numbers).
>>>> You can make a positive assumption for the y1 and plot them on one y-axes
>>>>
>>>> yscale('log')
>>>> axis(ymin=1e+20, ymax=1e+30)
>>>>
>>>> Still this won't let you see the functions trends that you are looking
>>>> to see. I would suggest you to use multipe figures or investing a bit more
>>>> time to use parasite axes example of JJ.
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Gökhan
>>>>
>>>
>>>
>>>
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