**Calculating area under graph from results of a for loop**
Im currently designing a shock absorber for an aircraft undercarriage, i have input all the relevant information and formulas into Matlab and created an M file with a functioning for loop giving a graph. The problem i'm having now is that in order to work out the area under the graph that i get from the file i need a line of best fit, which cannot be plotted in matlab on a for loop with the use of hold on and hold off. The code i wrote is at the bottom of this post

**Is it possible to either put the results of the for loop into a vector to plot or failing that another way to get matlab to calculate the area under each graph.**
**The code i have created is below:**
```
%Given Values
force=50620;
stat2ext=4/1;
comp2stat=3/1;
loadfactor=2.5;
staticP=7000000;
%Loads
load4ext=(1/(stat2ext))*(force*loadfactor)
load4stat=(force*loadfactor);
load4comp=comp2stat*(force*loadfactor);
%Pressures
p1=(1/(stat2ext))*staticP;
p2=staticP;
p3=comp2stat*staticP;
%Piston Area
areaP=load4stat/p2;
radiusP=sqrt(areaP/pi);
strokemax=0.5;
n1=1.1;
n2=1.35;
for stroke=0.1:0.01:0.5;
%Displacement
displacement=strokemax*areaP;
v1=(displacement*p3)/(p3-p1);
v3=v1-displacement;
volumedown=stroke*areaP;
vn=v1-volumedown;
pn= (p1*v1)/vn;
pn1= (p1*v1^1.1)/vn;
pn2= (p1*v1^1.35)/vn;
load=areaP*pn;
load1=areaP*pn1;
load2=areaP*pn2;
hold on
plot(stroke,load)
plot(stroke,load1)
plot(stroke,load2)
hold off
```

Thanks any suggestions or pointers would be greatly appreciated