Multiple Equation Iteration with one Variable

To whom it may concern, I am working on a homework that requires us to iterate a neutral axis depth, c, that satisfies Comp = Tens. The only problem is that C is dependent on fc which is dependent on Epsilon.

If you look at the attached code Ep4 is dependent on c but fpc4 is found from a graph provided of various point of stress and strain and uses Ep4 as the x value to find the y value fpc4. Then C uses fpc4 to find a value and T stays constant with C having to change to reach the T value.

Code: %Point 4 %Trial and Error c value c = 6.8998; Ep4 = (Epy/(d-c))*c; fpc4 = interp1(SR,SS,Ep4) C = 0.85*fpc4*0.75*b*c T = As*fy Cur4 = Ep4/c Mcr4 = T*(d-(c*0.75/2))

Let me know what you think/figure out! Thanks, Cory