Dear Sirs/Madams.

I'm trying to solve numerically this equation:

K1= (Jp/J0) * ( (J0-B) / (Jp-B) )

K2= ( (1/Jp) - (1/J0) )

t= (1/(A*B^2)) * ln ( K1 - B * K2) <- this is the equation

Where t, J0, A and B are constants

and Jp is unknowned.

In my example:

t=0.1

A=1,88E+05

B=6,974

When I try to solve numérically (bisection method and secant method),

log of a negative value doesn't exist and then there is an error.

I have transformed the equation into another one, taking exponential function left and right

and then the value of the exponential is a very big number

and the method fails too (note that A is a big number).

I have tried with Matlab.

I'm sure the solution exists because

I have had the A an B values using

a mathemathical software (MathCad).

Does anyone have a solution

or an idea to solve this problem ?

I will be very gratefull to you.

Thanks in advance.

Pepelu.