Is this function write correct: -((exp(-x)​*cos(y)+2*​x)/(exp(-x​)*sin(y)))

Is this function write correct: -((exp(-x)*cos(y)+2*x)/(exp(-x)*sin(y))) function is: -(e^(-x)*cos(y)+2x)/(e(-x)*sin(y))). Thanks

[Jan]

What does "e(-x)" mean? Did you forget a ^ ?

Answer 1

[Martin MacKinnon]

I'm guessing are you asking if the function on the left hand side is the MATLAB version of the function on the right hand side? If so, it appears to be correct - although the function on the right has one extra bracket.

[Tomas Schnierer]

Yeah, Matlab function is on the left side

Answer 2

[Jan]

It depends on what "x" and "y" are. If they are scalars and the "e(-x)" should be a "e^(-x)", the only difference between the formula and the code is going from e^x to exp(x). And then, yes, this is correct.

Do you have any reasons for doubts?

Answer 3

[Star Strider]

It is, but it’s always best to vectorise it:

f = @(x,y) -((exp(-x).*cos(y)+2*x)./(exp(-x).*sin(y)));

See the documentation for Array vs. Matrix Operations for details.

Also, see the documentation for meshgrid (and ndgrid) as well), if you want to evaluate it most efficiently for a range of values for ‘x’ and ‘y’.