# does sagemath support fresnels function?

I am trying to run integration on file that contains problems using fresnels functions. I am not even able to load the file, since sagemath complains that it does not know fresnels.

This function is there in sympy http://docs.sympy.org/latest/modules/...

```
>python
Python 3.6.5 |Anaconda, Inc.| (default, Apr 29 2018, 16:14:56)
>>> from sympy import *
>>> fresnels(x)
fresnels(x)
```

But in Sagemath

```
sage: var('x')
x
sage: fresnels(x)
NameError Traceback (most recent call last)
<ipython-input-10-08120c00ce46> in <module>()
----> 1 fresnels(x)
NameError: name 'fresnels' is not defined
```

It is no problem for this to fail, as I can capture the exception. But the problem is that I can't even load the file itself to begin with. The sage script I have starts by reading a plain text file, which contains a list of the problems. Like this

```
var('a b c d e m n x ')
lst=[[x^7*fresnels(b*x),x,6,],
[x^6*fresnels(b*x),x,6,],
[x^5*fresnels(b*x),x,5,],
[x^4*fresnels(b*x),x,5,]]
```

The sage script does this

```
load(currentTestFile)
```

Where the `currentTestFile`

is as shown above.

And once loaded, it iterates over each integral in the list and run it. But it seems sage parses the file during loading:

```
>./build_giac.sage
Test starting.....
load(currentTestName) #read the problems. This also contains the var('') statement.
File "sage/misc/persist.pyx", line 136, in sage.misc.persist.load (build/cythonized/sage/misc/persist.c:2440)
File "/usr/lib/python2.7/site-packages/sage/repl/load.py", line 263, in load
exec(preparse_file(f.read()) + "\n", globals)
File "<string>", line 3, in <module>
NameError: name 'fresnels' is not defined
```

So I am not able to even load the file. If I can even load the file, then if the integral fails afterwords, it is OK, since I can trap the exception, mark it as failed, and go to the next integral.

First question is: Does Sagemath have no support for fresnels? And in this case, how could one bypass this error during reading of the input file to give me a change to run the integrals?

Using SageMath version 8.3.rc2, Release Date: 2018-07-22

Thank you

--Nasser

Hey! It seems that the support to Fresnel integrals starts with Sagemath 8.3 beta4.

https://trac.sagemath.org/ticket/24212

I didn’t read all the ticket, but if it is correct, it is very nice!

If you could try the fresnel_sin() command, tell me if it works. I’m still using Sagemath 7.5 :/

I confirm that 8.3.rc3 has

`fresne_sin`

and`fresnel_cos`

.