Plotting the graph for THERMAL RECOVERY

How do i use the erfc function together with fzero? this is the equation i'm trying to solve exp(tcd)*erfc(sqrt(tcd))-0.909 = 0

Answer 1

[David Wilson]

Plot it, and you'll quickly see where the root is:

f = @(tcd) exp(tcd).*erfc(sqrt(tcd))-0.909; 
tcd = linspace(0,0.02);
plot(tcd,f(tcd))

Now use your favourite root solver, starting say from 0.01.

>> tcd = fsolve(f,0.01)

Equation solved.

fsolve completed because the vector of function values is near zero
as measured by the default value of the function tolerance, and
the problem appears regular as measured by the gradient.

<stopping criteria details>

tcd =
    0.0076