How can i apply a exponential model on a matrix?

Hello everyone,

I have some problems with a code i just made.

I create the following code to calculate a flow with a exponetial model. For one line of data, it works.

F =@(x,C)(x(1)-((x(1)-x(2))*exp(x(3)*t)));

x0=[max(C) C(1,1) 0.01];

x= lsqcurvefit(F,x0,t,C(1,:));

fluxexp=(x(1)-x(2))*x(3)

My problem comes when i try to transpose the code for a matrix of data ( several lines of data), it doesn't work but i don't know why.

for i= 1:length (Indeximp)-2

F = @(x,C)(ximp(1)-((ximp(1)-ximp(2))*exp(ximp(3)*t)));

x0=[max(C(i)) C(i,1) 0.0004];

ximp(i)= lsqcurvefit(F,x0,t,C(i,:));

fluxexp(i)=(ximp(i,1)-ximp(i,2))*ximp(i,3); end

If somebody can help me, it could be great.

Thank you