Column vector calling in a loop

I have been receiving 12 columns instead of 4 when I run it. I have tried to run a while loop to only run one value from the column at a time but I have been getting errors. I am not sure how to call specific row and column placements from the vectors. This is my crude attempt at it. I really appreciate your help. Any revamp is also appreciated.

R1=119.2; %%Resisters

R4=119.1; %%Resisters

Rpot=120.1; %%Potentiometer

Ro=120.2; %%Strain Gage Resistance Unloaded

Ri=909.0909;

Rf=1000000;

Vs=5; %%Voltage

GF=2.14; %%Gage Factor

E=10.4; %%Modulus of Elasticity Aluminium

Vo1=[0; 1.64; 1.565; 1.606; 1.615; 1.593; 1.648; 1.465; 1.595; 1.545; 1.63; 0;] %%Output voltage Item 1

Vo2=[0; 1.716; 1.56; 1.61; 1.661; 1.682; 1.705; 1.59; 1.64; 1.687; 1.661; 0;] %%Output voltage Item 2

Vo3=[1.667; 1.69; 1.68; 1.705; 1.711; 0; 1.698; 1.62; 1.626; 1.65; 1.687; 0;] %%Output voltage Item 3

Vo4=[1.75; 1.713; 1.635; 1.715; 1.766; 0; 0; 0; 0; 0; 0; 0;] %%Output voltage Item 4

Vbridge=[Vo1 Vo2 Vo3 Vo4]/((1+Rf/Ri)) %%Bridge Voltage Output

y=1

x=1

while x<=12

      while y<=12
          Rg(x,y)=-((Rpot*(Vbridge(x,y)+Vs)+R1*Vbridge(x,y))/(R4*Vbridge(x,y)+R1*(Vbridge(x,y)-Vs)))
          y=y+1
      end
      x=1
      x=x+1
  end

Answer 1

[Walter Roberson]

Recode

y=1

x=1

while x<=12

        while y<=12
            Rg(x,y)=-((Rpot*(Vbridge(x,y)+Vs)+R1*Vbridge(x,y))/(R4*Vbridge(x,y)+R1*(Vbridge(x,y)-Vs)))
            y=y+1
        end
        x=1
        x=x+1
    end

as a pair of for loops:

for x = 1 : 12
  for y = 1 : 12
    Rg(x,y)=-((Rpot*(Vbridge(x,y)+Vs)+R1*Vbridge(x,y))/(R4*Vbridge(x,y)+R1*(Vbridge(x,y)-Vs)))
  end
end

[Chaz]

it is still outputting 12 columns with 12 values instead of 4 columns with 12 values. Its like the vectors are dividing themselves and I have no idea how to fix it. I really appreciate this

[Walter Roberson]

Your code had "while" for x and y, both with limits of 12. That is going to get you a 12 x 12 result if it works at all. Which it will not, because your VBridge is not that large.

You should code

for x = 1 : 12
  for y = 1 : 4
    Rg(x,y)=-((Rpot*(Vbridge(x,y)+Vs)+R1*Vbridge(x,y))/(R4*Vbridge(x,y)+R1*(Vbridge(x,y)-Vs)))
  end
end

(with no while loops). This will give you a 12 x 4 result for Rg

[Chaz]

Do you know how to just make it print the last set of data found? It is printing every iteration right now. I know I didn't say I wanted that so your code is correct.

[Walter Roberson]

At the end of the Rg(x,y)= line, put a semi-colon

      Rg(x,y)=-((Rpot*(Vbridge(x,y)+Vs)+R1*Vbridge(x,y))/(R4*Vbridge(x,y)+R1*(Vbridge(x,y)-Vs)));