Where is the ellipticf function?

According to this MathWorks website:

https://www.mathworks.com/help/symbolic/ellipticf.html

Matlab has an incomplete elliptic integral function.

It doesn't seem to exist in my copy, running 2017a, with symbolic toolbox installed. The website doesn't seem to indicate that this function requires any non-standard toolbox except possibly symbolic math. What gives?

Answer 1

[Star Strider]

It’s there, and will respond if you call it correctly.

MATLAB is case-sensitive:

s = [ellipticF(pi/3, -10.5), ellipticF(pi/4, -pi),...
ellipticF(1, -1),  ellipticF(pi/2, 0)]

s =
   618.4459e-003   648.5970e-003   896.3938e-003     1.5708e+000

while:

s = [ellipticf(pi/3, -10.5), ellipticF(pi/4, -pi),...
 ellipticF(1, -1),  ellipticF(pi/2, 0)]

Cannot find an exact (case-sensitive) match for 'ellipticf'

The closest match is: ellipticF in C:\Program
Files\MATLAB\R2017a\toolbox\symbolic\symbolic\@double\ellipticF.m

[Roy Goodman]

Thanks. I think my confusion came from the fact that the "lookfor" command misses it:

">>lookfor ellipt" comes up with 15 responses, but not this one!

What's more, tab-completion fails to find any completions for "ellipt".

[Star Strider]

My pleasure.

Interesting about lookfor. I’ll bring this thread to the attention of MathWorks so they can look into it.