Where is the ellipticf function?

Question

Roy Goodman 2017-8-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351602-where-is-the-ellipticf-function

编辑： Roy Goodman 2017-8-4

采纳的回答： Star Strider

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?

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Answer 1

Star Strider 2017-8-4

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351602-where-is-the-ellipticf-function#answer_276855

在 MATLAB Online 中打开

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