How to use interp1 in for loop?

I have a curve representing engine power. I have to find a particular value on this curve where my engine power curve intersects. This I have to find at each step ranging from 1 to 1875 values. I used interp1 function but it gives error that it requires atlas 2 values to compute. My x-axis is Engine Power (Torque multiplied speed) and y-axis has either speed/torque. When I enter this graph with my engine power i need the point where I can find exact value on curve so that I would know the torque and speed for the power. Hoping for a positive reply

[Muhammad Usman Saleem]

read documentations about interpolate1 it is interpolating data in one dimension. Please share data use and code you are trying

[Akshay Apte]

for it=1:numel(t)
%Battery power 
if Pel(it)>0

      %control strategy
      socmin=0.3;
      socmax=0.7;

      if (soc(it-1)<socmin)||((soc(it-1)<socmax)&&(Switch==1))

          r(it)=min(1,(soc(it-1)-socmin)/(socmax-socmin));
          Peng1(it)=(1-r(it)).*((Pel(it)/EffPE)+Auxpower);
          Eng_rpm_act(it)=interp1(Pool_engine(it),ool_speed_int(it),Peng1(it),'linear');
          Eng_tq_act(it)=interp1(Pool_engine(it),ool_tq_int(it),Peng1(it),'linear');
          Peng(it)=Eng_rpm_act(it).*Eng_tq_act(it)*pi/30;
  end

This is just a part of the program. I need Eng_rpm_act and Eng_tq_act at each step. If there is another method please share. Pool_engine is the curve consisting of-ool_speed_int and oil_tq_int multiplied. Thanks