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Re: What the meant of the symbols # and & on the following example
Posted:
Jan 30, 2013 10:05 PM


On Monday, January 28, 2013 11:42:30 PM UTC8, Chris wrote: > Bellow is presented an eigenvalue resultant of a jacobian matrix... where appears (..)#1 and (..)#1^2,& what it means? > > > > Root[C0 CG^2 vG^2 vL \+(2 C0 CL^2 vG vL \[Alpha]^2 \[Rho]L^2+C0 CL^2 vL^2 \[Alpha]^2 \[Rho]L^2) #1+([Alpha] \[Rho]L^2C0 CL^2 vG \[Alpha]^2 \[Rho]L^22 C0 CL^2 vL \[Alpha]^2 \[Rho]L^2) #1^2&,1] > > > > best regards
This is what Mathematica calls a pure function. The # represents a variable. #1 is one variable, #2 would be another. In your result, #1 is one new variable Mathematic added. #1^2 is that variable squared. The & is just a sign that the preceding is a pure function.
For example, you could write a function lixe this:
f[x]:= x^2
or you could write it as a pure function:
f=#^2&
Either way, f[3] would give you an answer of 9, and f[x+y] would return (x+y)^2.



