How can I write a code for cicuits?

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Mariam Al Zarouni 2020-4-6

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评论： layla Hweij 2020-4-14

I am asked to Write a program in MATLAB to analyze a circuit. The circuit contains of n Resistors, n/2 capacitors, n/2 coils and an AC voltage source in the form of V Vm wt = + cos( )  .

The following requirements should be fulfilled

1. The number of resistances, n, has to be even number.

2. The minimum value for n is 2.

3. If the number of resistances is n, the number of coils must be n/2 and the number of capacitors must be n/2. The user will be prompted to enter the correct number if it is different from n/2

4. The values of all resistors, coils and capacitors must be real and positive

Please help me with the code.. I'm dying trying to find videos and tutorials

Sample example 1 (note: The red colour represents the data entered by the user) Enter the resistance values in ohm, [R1...Rn]=[10 30 20] The number of resistances should be even. Reenter values of the two resistances in Ohm, [R1...Rn]=[10 20 40 100] ==============================================================================

Enter the capacitance values in Farads, [C1...Cn/2]=[0.01 0.02 0.04]

The number of capacitors should be 2, 1/2 number of resistances Enter the capacitance values in Farads, [C1...Cn/2]=[0.01 0.02] ==============================================================================

Enter the inductance values in Henry, [L1...Ln/2]=[0.3 0.2] ==============================================================================

Enter the amplitude of the voltage source in volt, Vmag=10

Enter the phase of the voltage source in degree, Vphase=0

Enter the frequency of the voltage source in rad/s, Freq=100

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Mariam Al Zarouni 2020-4-7

编辑：darova 2020-4-7

在 MATLAB Online 中打开

I want to write a while loop code where i can ask my user to enter an infinite but EVEN number of values . Theses values must be real and positive. If the values enetered by the user satisfy my condition, it will end the the loop.

My attemtps where many and they all didn't end well , most ended with a red message from matlab:)

Hope you can help me with the code

clear all ;
close all;
equation=false;
while equation==false
    Resistors=input(' Enter values of two resistances in ohm [R1 R2]= '); % to enter tha values of the resistors
    Total=length(Resistors);
    m= Resistor
    if mod(m,2) == 0
        [row,column]=size(Resistors);% matrix of the resistors
        if isreal(Resistors) && row==1 && column>=2 % this is to make sure the values are real and the matrix is one row and two columns
            for number=1:Total
                if Resistors(number)>0 % value of the resistor is positive or otherwise
                    equation=true;
                elseif Resistors(number)<=0
                    equation=false;                    
                    break;
                end
            end
        end
    end
    
    if equation==false
        disp(' invalid numbers .... please enter valid numbers')
    end
end
disp ('===================================================================')

John D'Errico 2020-4-7

编辑：John D'Errico 2020-4-7

You want to enter an infinite number of resistors? That will not take a long time to run?

Until you learn to write code carefully and to debug it, you won't get far writing code. I'm sorry, but this is true.

Here, for example, you most immediate error is that you enter the resistors in the variable Resistors, yet then you use the variable Resistor.

While that is most likely just a typo, MATLAB does not know this.

Computers cannot read your mind. Perhaps the indicated error was not a mistake, but intentional. They try to do what you tell them to do, and then if something happens that is a problem, they return an error message indicating what it sees as the problem.

So you need to learn to read the error message, then look at your code and fix it. Sometimes that is best done using the debugger to track down your problem. Here the error message would have said something about the existence of a variable or function named Resistor. Since you apparently wanted to use the variable Resistors, you should have seen the problem immediately.

I have a funny feeling that your code has at least two other errors in it. But learning to use the debugger will help you greatly.

Mariam Al Zarouni 2020-4-7

在 MATLAB Online 中打开

Sorry for disturbing you again, but if i wanted to specify things for example if the number of values isn't even i want a sentence to be displayed saying "rewrite the values aking sure their number is even" and if the numbers entered by the user are complex and negative which is opposite to my code i also want a similar message to show.. so basically for each condition i want a message to be displayed.. I tried playing around with the end of the code and it got me somewhere but not exactly my wish.. could you give me your tips, guidience, and little bit help?

clear all ;
close all;
equation=false;
while equation==false
    Resistors=input(' Enter the resistance values in ohm, [R1...Rn]= '); % to enter tha values of the resistors
    V=length(Resistors);
    
    if mod(V,2) == 0
        [row,column]=size(Resistors);% matrix of the resistors
        if isreal(Resistors) && row==1 && column>=2 % this is to make sure the values are real and the matrix is one row and two columns
            equation=true;
        
            for number=1:V
                 isreal(Resistors) && row==1 && column>=2==false
                    disp(' Re-enter the resistances by which the number of resistors is even ')
            break;
                    
                if Resistors(number)>0 % value of the resistor is positive or otherwise
                    equation=true;
                elseif Resistors(number)<=0
                   
                    equation=false;
                    disp('  Re-enter the resistances where  its values are positive and real ')
                    break;
                    
                end
            end
        end
    end
    
    
    
end
disp ('===================================================================')

Mariam Al Zarouni 2020-4-7

在 MATLAB Online 中打开

Hello againn, sorry but i've been working on what i have and got this.. for some reason, the sentence "Re-enter the resistances by which the number of resistors is even" keeps repeating with me in the output.. do you know a solution?

This is my code

clear all ;
close all;
equation=false;
while equation==false
    Resistors=input(' Enter values of two resistances in ohm [R1 R2]= '); % to enter tha values of the resistors
    V=length(Resistors);
  
    if mod(V,2) == 0
        [row,column]=size(Resistors);% matrix of the resistors
        if isreal(Resistors) && row==1 && column>=2 % this is to make sure the values are real and the matrix is one row and two columns
           
           for number=1:V
      
                if Resistors(number)>0 % value of the resistor is positive or otherwise
                    equation=true;
                else 
                    equation=false;
                   
                  break;
                end
           end
        end
      
        if equation==false
           disp('Re-enter the resistances where  its values are positive and real ')
           
        
        end
    end
  
    if equation==false
        disp('  Re-enter the resistances by which the number of resistors is even')
        
    end
end
disp ('===================================================================')

and this is my output

Enter values of two resistances in ohm [R1 R2]= [8 7 6]
  Re-enter the resistances by which the number of resistors is even
 Enter values of two resistances in ohm [R1 R2]= [8 -7]
Re-enter the resistances where  its values are positive and real 
  Re-enter the resistances by which the number of resistors is even
 Enter values of two resistances in ohm [R1 R2]= [7 8]
===================================================================

layla Hweij 2020-4-14

this is rest of mariam question if you want a clearer verison of what im saying

==============================================================================

The Alpha should be positive real number between (0 and 2), check the value and enter it again

Enter the Alpha (between 0 and 2) to be used with the Successive Relaxation Method=0.5

==============================================================================

The impedance matrix to solve the mesh current is:

1.0e+02 *

0.1000 - 0.0100i -0.1000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i

-0.1000 + 0.0000i 0.3000 - 0.0003i -0.2000 + 0.0000i 0.0000 + 0.0000i

0.0000 + 0.0000i -0.2000 + 0.0000i 0.6000 - 0.0050i -0.4000 + 0.0000i

0.0000 + 0.0000i 0.0000 + 0.0000i -0.4000 + 0.0000i 1.4000 - 0.0005i

The voltage vector to solve the mesh current is:

I'm stuck at this point

approximated, exact=

1.7813+0.33424i 1.7857+0.33861i

0.816+0.15698i 0.81954+0.16005i

0.33475+0.067759i 0.33674+0.069396i

0.095532+0.019329i 0.096204+0.019862i

relative error, significant digit=

0.0034088 3

0.0056082 2

0.0074962 2

0.0087305 2

Magnitude Phase

1.8124 10.6275

0.8310 10.8894

0.3415 11.4432

0.0975 11.4380

Please if you can help us, it will be wonderful since I dont have much time left to the deadline ...

darova 2020-4-14

Create new question

and use special button

layla Hweij 2020-4-14

and here is the result including the voltage vector , the actual current and supposed relaxation method that will give me the approximated current

========================================

The Voltage vector to solve the mesh current is:

The current:

1.166 - 0.16397i

0.14959 - 0.28057i

0.062247 - 0.11448i

0.01285 - 0.034543i

========= this is Relaxation Method ========

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