MATLAB: How to solve three complex equations

nmo

please find the attached file for an example of the system

Thanks in advance

Best Answer

Easy using matrix notation:

A = [1.46j,0.9j,-0.36j;0.36,-0.42,-1.345;0.9j,1.65j,0.42];
b = [1;0;1];
I = A\b
I =
  -0.0059 - 0.4749i %I1
   0.0079 - 0.3480i %I2
  -0.0040 - 0.0184i %I3

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MATLAB: How to make a permanent change to a matrix using sortrows

 P = sortrows(P,7) ;

Most of the time functions don't operate "externally", so SORTROWS doesn't alter your array P defined in the workspace. It creates a new sorted array that it outputs. You have to store this output back into P if you want P to be the sorted version. If you wanted to keep the original, you could store it into a new variable:

 P_sorted = sortrows(P,7) ;

MATLAB: Check for missing argument or incorrect argument data type in call to function ‘solve’. Error in LinearProject (line 35) I=solve(eq1, eq2, eq3, eq4); The program just print the first 4 i’s. The program should print 44 i’s. How to solve

syms i1 i2 i3 i4 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11;

i1 i2 i3 i4 start out as symbolic

    eq1 = 3-V(j,1)*(i1)-V(j,2)*(i1-i4)-V(j,3)*(i1+i2)-V(j,4)*i1==0;
    eq2 = 3-V(j,4)*(i2 + i3)-V(j,8)*(i2+i4)-V(j,3)*(i2+i1)-V(j,5)*(i2)-V(j,6)*(i2+i3)== 0;
    eq3 = 3-V(j,7)*(i2+i3)-V(j,10)*(i3-i4)-V(j,6)*(i3+i2)-V(j,9)*i3==0;
    eq4 = V(j,2)*(i4-i1)+V(j,8)*(i2+i4)+V(j,10)*(i4-i3)+V(j,11)*i4==0;

and get used in those equations, so those start out as symbolic equations

    i1=0;
    i2=0;
    i3=0;
    i4=0;

Now they are assigned numeric, so they are no longer symbolic. So when you loop back to eq1 etc, those become expressions of numeric values == numeric values, which gives a logical result, not symbolic.

Best Answer

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MATLAB: How to make a permanent change to a matrix using sortrows

MATLAB: Check for missing argument or incorrect argument data type in call to function ‘solve’. Error in LinearProject (line 35) I=solve(eq1, eq2, eq3, eq4); The program just print the first 4 i’s. The program should print 44 i’s. How to solve

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