Try this:
>> a= input('Enter First Strain Gauge readings');
b= input('Enter Second Strain Gauge readings');
c= input('Enter Third Strain Gauge readings');
theta2 = input('Enter Angle Between A and B');
theta3 = input('Enter Angle Between B and C');
theta1=0;
i=0.5*(1+cos(0.0174*2*theta1));
j=0.5*(1-cos(0.0174*2*theta1));
k=0.5*sin(0.0174*2*theta1);
l=0.5*(1+cos(0.0174*2*theta2));
m=0.5*(1-cos(0.0174*2*theta2));
n=0.5*sin(0.0174*2*theta2);
o=0.5*(1+cos(0.0174*2*theta3));
p=0.5*(1-cos(0.0174*2*theta3));
q=0.5*sin(0.0174*2*theta3);
Enter First Strain Gauge readings 32
Enter Second Strain Gauge readings 43
Enter Third Strain Gauge readings 4
Enter Angle Between A and B 42
Enter Angle Between B and C 45
>> a1=i*x + j*y + k*z -a;
>> syms x y z;
>> a1=i*x + j*y + k*z -a;
>> a2=l*x + m*y + n*z -b;
>> a3=o*x + p*y + q*z -c;
>> [x1, y1, z1] = solve(a1,a2,a3,'x','y','z')
I obtain this answer (remember I have entered random values for the strain gauge readings and angles).
x1 =
32
y1 =
-6045918607341835657578447208438336/7972281774681996275424235458761
z1 =
5824429148451108692498456082010944/7972281774681996275424235458761
If you want your answer in numeric format:
>> eval(y1)
ans =
-758.3674
