
#1
Nov2311, 09:21 AM

P: 2

Hello,
I'm quite new to Mathematica and stuck at a point, where I have searched for hours to find a solution, but there seems no way out. Let's say we have two functions, f1[x_,y_]=x+y f2[x_,y_]=x*y How can a build a function f3, which is e.g. the sum of the other functions f1 and f2, i.e. f3[x_, y_]=x+y+x*y, but without copy&paste, but with direct dependency on f1 and f2? With f3=f1[x,y]+f2[x,y], the functional dependency on x and y is missing. I need a f3, which also has the same input arguments as f1 and f2 (namely x and y). With f3[x_,y_]==f1[x,y]+f2[x,y] the functional dependency on the parameters is also not working. Thanks you for your help, I'm really desperate :( 



#2
Nov2311, 09:29 AM

P: 2,070

I think that you don't understand the difference between =(immediate assignment), :=(delayed assignment) and == (test for equality). You want to use := in function assignments so that the assignment is not made until you request evaluation. Try the attached notebook  I think it does what you want.




#3
Nov2311, 04:49 PM

P: 2

Hi,
a thousand thanks! This is exactly what I was looking for! Sorry for my dummy question, it really seems so dummy now :s Thank you again for your profound and amazingly fast help, you really made my day! :) 



#4
Nov2311, 05:33 PM

P: 2,070

Mathematica beginner question: Function nesting
You're welcome. Glad I could help.



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