Interpolation using for loop

Hi all;

I have a table temperature (35040 X 6),

Space mesh (1 X 104),

And Z_sensor (1 X 6)

I want to interpolate them to find the initial temperature using a for loop. Can someone help me with that?

Thank you!

for i =1: length(z_mesh)
    T(i,1) = interp1( z_mesh, temp(i,:),  z_sensor,'linear');
end

[Torsten]

Your question is not clear.

You usually have x and y data of the same length and you try to interpolate y (yq) at a new given x-position xq. What are x,y and xq in your case ?

[Sanley Guerrier]

In my case x is z_sensor , y is Temp, xq is z_mesh.

[Torsten]

So you want to interpolate 6 temperatures at 6 positions to 104 other positions ? And the 35040 rows are the temperatures at the 6 positions at different times ?

[Sanley Guerrier]

Yes, correct.

[Torsten]

Is it correct then that you are given a single value for time (tq) and a single value for z_mesh (xq) and you want to interpolate Tq from a given time vector t, a sensor vector x (z_sensor) and a temperature matrix T ?

Then study how to use "interp2" instead of "interp1".

E.g.

tstart = 0;
tend = 10;
dt = 0.1;
zstart = 0;
zend = 1;
dz = 0.1;
z = zstart:dz:zend;
t = (tstart:dt:tend)';
T = z.^2+t.^2;
tq = 9.25;
zq = 0.135;
Tq = interp2(z,t,T,zq,tq)

Tq = 85.5855

[Sanley Guerrier]

Thank you!

Answer 1

[Matt J]

You don't need a for-loop to interpolate successive temp(i,:). Just do,

 T = interp1(z_sensor, temp', z_mesh  ,'linear');

[Sanley Guerrier]

I need it because it will be used later to construct a matrix.

[Matt J]

Whatever you are doing later is unrelated to the task you describe in your post. The code I gave you is equivalent to what the loop you posted is trying to do.

[Sanley Guerrier]

yes, you are right I can use it without a for loop. thanks.