# Ffmatlib.idp import error

**URL:** <https://community.freefem.org/t/ffmatlib-idp-import-error/823>\
**Category:** General Discussion\
**Created:** [February 23, 2021, 5:48am UTC](https://community.freefem.org/t/ffmatlib-idp-import-error/823 "2021-02-23T05:48:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sumantkr](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/sumantkr/32/2681_2.png) [@sumantkr](https://community.freefem.org/u/sumantkr)\
**Post date:** [February 23, 2021, 5:48am UTC](https://community.freefem.org/t/ffmatlib-idp-import-error/823/1 "2021-02-23T05:48:40Z")

</div>

I am getting error in importing **ffmatlib.idp**.  
Kindly comment me to figure it out.

Also, I am trying to save the solution for T over the entire domain [0,1]\*[0,1].  
by:

```
ofstream ff1("T_domain.dat");

for(int i = 0; i<=100; ++i)
{
for(int j = 0; j<=100; ++j)
{
  real xval = i/100.;
  real yval = j/100.;
  ff1<< xval<<","<<yval<<","<<T(xval, yval)<<endl;
}
}

```

But the output file contains the coordinate (o, yval).

Help me to get the solution for T over the entire domain and import of module ffmatlib.idp

@prj