need to determine value of 'x ' from several different graphs corresponding to a particular value of 'y', then combine them in a matrix.....

hi every one, basically i was stuck in a problem that the main aim of it was to determine value of 'x ' from several different graphs corresponding to a particular value of 'y', then combine them in a matrix. does any one know how to do it in a simpler way.... below is my source code . i have plotted strainrate on y axis & time on x axis,so i need to calculate time @ strainrate=.116 from all the 7 graphs...

clc
clear
sigmahoop =3.34*45/5;  % P*r/t hoop stress formula
temprate=[1 5 10 15 20 25 50]'; %temperature rate
toper=310+273;  %operating temp 
time=[1:400];  %time taken

for i=1:7
for j= 1:400

fun= @(t)(exp(-29200/(toper+temprate(i,1))));                        %declaring a function to integrate
in(i,j)=(1+2e10*integral(fun,0,j,'ArrayValued',true))^.42;           %integrating function

strainrate(i,j)= 1.3e-5*sigmahoop^9*exp(-36600/(toper+time(1,j)*temprate(i,1)))+((5.7e7*sigmahoop^1.8*exp(-29200/(toper+time(1,j)*temprate(i,1))))/in(i,j))*100;
if strainrate(i,j)>=.35
   strainrate(i,j)=NaN;

end
end
    end

plot(time(1:400),strainrate(1:1,1:400))
figure

plot(time(1:80),strainrate(2:3,1:80))
figure

plot(time(1:26),strainrate(4:5,1:26))
figure

plot(time(1:16),strainrate(6:7,1:16))