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solving four equations to find I1, I2, I3, I4 as functions of R1, R2, R3, V1 and V2

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Moussa
Moussa 2023-12-10
评论： Torsten 2023-12-10
I have these four equations
  • 9*I1 – 2*I3 + V1 + 4 = 0
  • (5 + R3)*I2 – 5*I4 – 1 = 0
  • -2*I1 + (2 + R1 + R2)*I3 - R1*I4 + 5 = 0
  • -5*I2 - R1*I3 + (R1 + 15)*I4 + V2 = 0
I used the following code to find I1, I2, I3, I4 as functions of R1, R2, R3, V1 and V2
syms I1 I2 I3 I4
eqn1 = 9*I1 – 2*I3 + V1 + 4 == 0
eqn2 = (5 + R3)*I2 – 5*I4 – 1 == 0
eqn3 = -2*I1 + (2 + R1 + R2)*I3 - R1*I4 + 5 == 0
eqn4 = -5*I2 - R1*I3 + (R1 + 15)*I4 + V2 == 0
sol = solve([eqn1, eqn2, eqn3, eqn4], [I1, I2, I3, I4]);
However, I encountered the following error:
eqn1 = 9*I1 – 2*I3 + V1 + 4 == 0
↑
Error: Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.
how can I find I1, I2, I3, I4 as functions of R1, R2, R3, V1 and V2

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回答（1 个）

Sulaymon Eshkabilov
Sulaymon Eshkabilov 2023-12-10
Ran in:
Here is the corrected code (there were some character problmes and undeclared V1 V2 R1 R2 R3 vars):
syms I1 I2 I3 I4 V1 V2 R1 R2 R3
eqn1 = 9*I1 - 2*I3 + V1 + 4 == 0
eqn1 = 
eqn2 = (5 + R3)*I2 -5*I4 - 1 == 0
eqn2 = 
eqn3 = -2*I1 + (2 + R1 + R2)*I3 - R1*I4 + 5 == 0
eqn3 = 
eqn4 = -5*I2 - R1*I3 + (R1 + 15)*I4 + V2 == 0
eqn4 = 
sol = solve([eqn1, eqn2, eqn3, eqn4], [I1, I2, I3, I4]);
% See the solutions
SOLUTIONS = [sol.I1; sol.I2; sol.I3; sol.I4]
SOLUTIONS = 

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