CODEWITHSUNDEEP
functionpython-3.xmapping
user3498115
user3498115

Reputation: 55

Adding the results of multiple functions

Using python 3.3

Stumbled upon another problem with my program. Its the same solar program. Again i decided to add more functionality. Its basically ad-hoc. I'm adding things as i go along. I realize it can be made more efficient but once i decide its done, I'll post the whole coding up.

Anyway, i need to add the results from multiple functions. Here's a part of my coding:

def janCalc():
    for a in angle(0,360,10):                                           #angle of orientation
        for d in days(1,32,1.0006630137):                               #day number of year
            for smodule in equation():                  #equation() function not shown in this coding
                total_jan+=smodule              #total_jan is already defined elsewhere              
        avg_jan=total_jan/(60*(1.0006630137*31))                
        ratio_jan=avg_jan/5.67
        calcJan=(ratio_jan*4.79)
        yield calcJan
        total_jan=0                     #necessary to reset total to 0 for next angle interval    

def febCalc():
    for a in angle(0,360,10):
        for d in days ((1.0006630137*31),61,1.0006630137):
            for smodule in equation():
                total_feb+=smodule
        avg_feb=total_feb/(60*(1.0006630137*28))
        ratio_feb=avg_feb/6.56
        calcFeb=(ratio_feb*4.96)
        yield calcFeb
        total_feb=0

#etc..............

Is there anyway to add the yield of each function? for e.g: calcJan+calcFeb+.....

I would like to get the total results under each angle interval and then dividing by 12 to get the average value per interval. Like so:-

0 degrees---->total/12

10 deg ---->total/12

20 deg ---->total/12

30 deg ---->total/12

........

360 deg ---->total/12

If you need more info, let me know.

ADDENDUM

The solution was essentially solved by @jonrsharpe. But i encountered a bit of a problem. 

Traceback (most recent call last):
  File "C:\Users\User\Documents\Python\Solar program final.py", line 247, in <module>
    output=[sum(vals)/12 for vals in zip(*(gen() for gen in months))]
  File "C:\Users\User\Documents\Python\Solar program final.py", line 247, in <listcomp>
    output=[sum(vals)/12 for vals in zip(*(gen() for gen in months))]
  File "C:\Users\User\Documents\Python\Solar program final.py", line 103, in janCalc
    for smodule in equation():
  File "C:\Users\User\Documents\Python\Solar program final.py", line 63, in equation
    d=math.asin(math.sin(math.radians(23.45))*math.sin(math.radians((360/365.242)*(d-81))))
NameError: global name 'd' is not defined

I've isolated it to: 

for d in days ((1.0006630137*31),61,1.0006630137):    
    for smodule in equation():

It turns out i can't reference a function from inside a function? I'm not too sure. So even my original coding did not work. I assumed it was working because previously i had not defined each month as a function. I should have tested it out first.

Do you know how to get around this?

Upvotes: 0

Views: 1112

Answers (1)

jonrsharpe
jonrsharpe

Reputation: 122026

A simple example to demonstrate how to combine multiple generators:

>>> def gen1():
    for x in range(5):
        yield x

>>> def gen2():
    for x in range(5, 10):
        yield x

>>> [sum(vals) for vals in zip(*(gen() for gen in (gen1, gen2)))]
[5, 7, 9, 11, 13]

Or, written out long hand:

output = list(gen1())
for index, value in enumerate(gen2()):
    output[index] += value

You can modify either version to include a division, too, so your case would look something like:

months = [janCalc, fabCalc, ...]

output = [sum(vals) / 12 for vals i zip(*(gen() for gen in months))]

Upvotes: 1

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