Changing varible/struct name on both side with a loop inside a function

Hello everyone,

I got a problem when I want to read some data from many structs. I got like 8 Struct, which is from E1.....E8.

Each of these structs got 9 variables/fields stored inside.

I need to do the same algoritmen for each of them, and then sum them up in the end.

Each of these struct got a real part and imaginary part for x,y,z direction.

I want to use this function for each of my struct and also change my variable name at the same time

for i=1:8
e(i)RealX= interp3(xx,yy,zz,E1.Real_Part_of_X_Comp_0s,xx0,yy0,zz0);
e(i)RealY= interp3(xx,yy,zz,E1.Real_Part_of_Y_Comp_0s,xx0,yy0,zz0);
e(i)RealZ= interp3(xx,yy,zz,E1.Real_Part_of_Z_Comp_0s,xx0,yy0,zz0);
e(i)ImgX = interp3(xx,yy,zz,E(i).Imaginary_Part_of_X_Comp_0s,xx0,yy0,zz0);
e(i)ImgY = interp3(xx,yy,zz,E(i).Imaginary_Part_of_Y_Comp_0s,xx0,yy0,zz0);
e(i)ImgZ = interp3(xx,yy,zz,E(i).Imaginary_Part_of_Z_Comp_0s,xx0,yy0,zz0);
end

EX= e1RealX.*e1ImgX+......e8RealX.*e8ImgX;
EY= e1RealY.*e1ImgY+......e8RealY.*e8ImgY;
EZ= e1RealZ.*e1ImgZ+......e8RealZ.*e8ImgZ;

E = EX+EY+EZ

I did look at this FAQ, which many people refer to, but I just don't think it fits my problem http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

I am not very strong at matlab and I would like to hear some advice to solve this in a smart way....

Thank you for help!

Nick

[Stephen23]

The best solution would be use a non-scalar structure, exactly as per Walter Roberson's Answer. This is the most efficient and neatest solution.

Note that creating variable names dynamically is inefficient, slow and buggy, do not be tempted to program using dynamic variable names. Read this to know why:

http://www.mathworks.com/matlabcentral/answers/196952-how-to-create-new-variables-in-batches-with-strcat

Answer 1

[Walter Roberson]

allE = {E1, E2, E3, E4, E5, E6, E7, E8};
for i = 1 : length(allE)
  e(i).RealX = interp3(xx, yy, zz, allE{i}.Real_Part_of_X_Comp_0s, xx0, yy0, zz0);
  e(i).RealY = interp3(xx, yy, zz, allE{i}.Real_Part_of_Y_Comp_0s, xx0, yy0, zz0);
  e(i).RealZ = interp3(xx, yy, zz, allE{i}.Real_Part_of_Z_Comp_0s, xx0, yy0, zz0);
  e(i).ImgX  = interp3(xx, yy, zz, allE{i}.Imaginary_Part_of_X_Comp_0s, xx0, yy0, zz0);
  e(i).ImgY  = interp3(xx, yy, zz, allE{i}.Imaginary_Part_of_Y_Comp_0s, xx0, yy0, zz0);
  e(i).ImgZ  = interp3(xx, yy, zz, allE{i}.Imaginary_Part_of_Z_Comp_0s, xx0, yy0, zz0);
end

Notice that this uses only the techniques from the FAQ link you indicated.

[Matt J]

Accepted.