CFD Online Discussion Forums - Problems with interpolating UDF

I'm trying to make a UDF that interpolates between values of a continuous curve defining wall temperature to evaluate the difference the interpolation makes on the solution.

Here is the working continuous UDF:

Code:

#include "udf.h"

#define t0 0.00288



DEFINE_PROFILE(panel_wall_7_temperature, thread, i)

{

        face_t f;

        double time;

        begin_f_loop(f, thread)

        {

                time = CURRENT_TIME;

                F_PROFILE(f, thread, i) = 300.0 + 100.0 * (time / t0) - 25.0 * pow((time / t0), 3.0);

        }

        end_f_loop(f, thread)

}

And here is the non-working interpolating UDF for 100 time steps doing interpolation between every 4th point in time:

Code:

#include "udf.h"

#include <vector>



#define t0 0.00288



main()



{

        int i;        

        double Tw4i[26]; 

        double t4i[26];

        

        for (i=0;i<26;i++)

                t4i[i]=4.0*i*t0/100; /*Assemble discretized time vector*/



        for (i=0;i<26;i++)

                Tw4i[i]= 300.0 + 100.0*t4i[i]/t0 - 25.0*t4i[i]*t4i[i]*t4i[i]/t0/t0/t0; /*Discretized Wall Temperature vector to interpolate to*/



DEFINE_PROFILE(panel_wall_7_temperature_sub100, thread, i)

{

        face_t f;

        double t;

        double TL;

        double TR;

        double tL;

        double tR;



        begin_f_loop(f, thread)

        {

                t = CURRENT_TIME; /*Current timestep time that FLUENT is calculating from*/



                for (i=0;i<25;i++)

                        TL=Tw4i[i]; /*Nearest Left Temperature*/

                        TR=Tw4i[i+1]; /*Nearest Right Temperature*/

                        tL=t4i[i]; /*Nearest Left time*/

                        tR=t4i[i+1]; /*Nearest Right time*/

                        

                        if (t>=tL && t<=tR)

                                F_PROFILE(f, thread, i) = TL + ((TR-TL)/(tR-tL))*(t-tL); /*Linear interpolation to surrounding discrete temperature values*/



        }

        end_f_loop(f, thread)

}

}

Error output in fluent:
Copied H:\Research\Fluent\100 Timesteps\Subcycling\panel-wall-7_temperature_100_Subcycling.c to libudf\src
(system "copy "C:\PROGRA~1\ANSYSI~1\v140\fluent"\fluent14.0.0\sr c\makefile_nt.udf "libudf\win64\3ddp_host\makefile" ")
1 file(s) copied.
(chdir "libudf")()
(chdir "win64\3ddp_host")()
'nmake' is not recognized as an internal or external command,
operable program or batch file.
'nmake' is not recognized as an internal or external command,
operable program or batch file.
(system "copy "C:\PROGRA~1\ANSYSI~1\v140\fluent"\fluent14.0.0\sr c\makefile_nt.udf "libudf\win64\3ddp_node\makefile" ")
1 file(s) copied.
(chdir "libudf")()
(chdir "win64\3ddp_node")()
'nmake' is not recognized as an internal or external command,
operable program or batch file.
'nmake' is not recognized as an internal or external command,
operable program or batch file.

Any idea what needs fixed for the latter? I have Visual Studio 2013 Ultimate through my school's Dreamspark program, so I don't get the 'nmake' error...