Unable to perform assignment because the left and right sides have a different number of elements.

I am getting error like this :Unable to perform assignment because the left and right sides have a different number of elements.

Error in classicalL (line 160)

EL(i)=Ef.*Vf+Em.*(1-Vf);

I am attaching my code. If you run the code the following questions will be asked. I already defined the values. so please click ok until u get error.

Thanks in advance.

Answer 1

[Cris LaPierre]

No error for me, but I had to guess what values to use for Lambda.

This error message occurs when your expression on the right creates a vector of numbers, but you are assigning it to a single entry (EL(i)).

Inspect the values of Ef, Vf, and Em to make sure they are always creating the values you expect.

[Sairama Krishnam Pothuri]

Hi, thank you for your reply. Can you explain in more detail. Whether I need to change my program or what.?.

And one more thing u mentioned about Lambda. I didnt have any lambda value. please give me in more detail.

Thanks in advance.

[Cris LaPierre]

Like I said, it worked for me. Can you provide the steps that create the error?

You might find it helpful to learn how to use the debugging tools in MATLAB.

[Sairama Krishnam Pothuri]

This is error I am getting When I run the program. I didnt understand why I am getting this.

Error:

Unable to perform assignment because the left and right sides have a different number of elements.

Error in classicalL (line 160)

EL(i)=Ef.*Vf+Em.*(1-Vf);

These are the steps where I am getting error. In this step I have some bold letters where I am getting error. please check it.

if Quest4==2 && Quest5==2

for i=1:1:n

prompt={'Ef (Modulus of Fibre)(GPa)', 'Ep (modulous of fibre in other direc)(Gpa)','Em Modulus of Matrix (GPa)','Gf Shear Modulus of Fibre (GPa)','Gm Shear Modulus of Matrix (GPa)','vf Poisson of fibre','vm Poisson of Matrix','Vf Volume fraction','Df Density of fibre (kg/m^3)','Dm Density of Matrix (kg/m^3)'};

def={'230','28','3.15','50','1.149635','0.23','0.37','0.486','1760','1200'};

TITLE='Consitant Properties of lamina' ;num2str(i),'in the laminate stack';

line=1;

ANSWER=inputdlg(prompt,TITLE,line,def);

convertc=char(ANSWER);

prec=str2num(convertc);

double(prec);

Ef(i)=prec(1); %Elastic Modulus of Fiber

Ep(i)=prec(2);

Em(i)=prec(3); %Elastic Modulus of Matrix

Gf(i)=prec(4); %Shear Modulus of Fiber

Gm(i)=prec(5); %shear Modulus of Matrix

vf(i)=prec(6); %Poison's Ratio of Fiber

vm(i)=prec(7); %Poison's Ratio of Matrix

Vf(i)=prec(8); %Volume Fiber Fraction

Df(i)=prec(9); %Density of Fiber

Dm(i)=prec(10); %Density Ratio of Matrix

% Calc material proeprties

EL(i)=Ef.*Vf+Em.*(1-Vf); In this line I am getting error

ET(i)=Ep.*Em/Em.*Vf+Ep.*(1-Vf);

vL(i)=vf.*Vf+vm.*(1-Vf);

vT(i)=ET.*vL/EL;

GLT(i)=Gf.*Gm/(Gm.*Vf+Gf.*(1-Vf));

GTL(i)=ET/(2.*(1+vT));

Den(i)=Df.*Vf+Dm.*(1-Vf);

end

end

As u mentioned that the code is working for you then please enter the angles or orientation values like 0, 90, 0,0, 90,0. see that u r getting the results or not.

Thanks in advance.

[Cris LaPierre]

Again, when I run your code, I do not get an error. I would like to know what values you are entering in each prompt. Specifically, what values are you using for lambda?

[Sairama Krishnam Pothuri]

Hi Cris Lapierre,

Thank you again for giving me answers with patience. Sorry I have defined wrong values in prompts. Instead of (2 in question 4 and 2 in question 5) I have defined (1 in question 4 and 1 in question 5) in previous code. Sorry It was my mistake But now I have changed. So again I am attaching my code with defined values in prompts. please check it or you please define the values like this:

If u run the code the following questions will be asked.

For question 1: please enter - 4

For question 2: please enter - 1

For question 3: please enter - 1

For question 4: please enter - 2

For question 5: please enter - 2

After this for the remaining I already defined the values. Only u need to define for the questions is :

For lamina 1 orientation: please enter - 0(Zero)

For lamina 2 orientation: please enter - 90

For lamina 3 orientation: please enter - 90

For lamina 4 orientation: please enter - 0(zero)

I am getting the error like this If I run the code by defining the above values:

This is error I am getting When I run the program. I didnt understand why I am getting this.

Error:

Unable to perform assignment because the left and right sides have a different number of elements.

Error in classicalL (line 160)

EL(i)=Ef.*Vf+Em.*(1-Vf);

Thanks in advance.

Answer 2

[Cris LaPierre]

The issue is you create Ef, Vf, Em as well as several other variables as vectors.

Ef(i)=prec(1)*10^9; %Elastic Modulus of Fiber
Ep(i)=prec(2)*10^9;
Em(i)=prec(3)*10^9; %Elastic Modulus of Matrix
Gf(i)=prec(4)*10^9; %Shear Modulus of Fiber
Gm(i)=prec(5)*10^9; %shear Modulus of Matrix
vf(i)=prec(6); %Poison's Ratio of Fiber
vm(i)=prec(7); %Poison's Ratio of Matrix
Vf(i)=prec(8);  %Volume Fiber Fraction
Df(i)=prec(9); %Density of Fiber
Dm(i)=prec(10);  %Density Ratio of Matrix

You probably want your equation to index these variables as well.

EL(i)=Ef(i).*Vf(i)+Em(i).*(1-Vf(i));

You'll have to make a similar change to all your equations.

ET(i)=Ep.*Em/Em.*Vf+Ep.*(1-Vf);
vL(i)=vf.*Vf+vm.*(1-Vf);
vT(i)=ET.*vL/EL;
GLT(i)=Gf.*Gm/(Gm.*Vf+Gf.*(1-Vf));
GTL(i)=ET/(2.*(1+vT));
Den(i)=Df.*Vf+Dm.*(1-Vf);

[Sairama Krishnam Pothuri]

Hi Cris Lapierre,

Thank you again for giving me answers with patience. I have modified my equations as u mentioned in the above. But now again I am getting different error. So, again I am attaching my Code by defining all the values. please run the code and check the error.

This is error I am getting When I run the program. I didnt understand why I am getting this.

Error:

Undefined function or variable 'theta'.

Error in classicalL (line 243)

Q11b(i)=(Q11(i)*(cosd(theta(i)))^4)+(Q22(i)*(sind(theta(i)))^4)+(2*(Q12(i)+2*Q66(i)))*((sind(theta(i)))^2)*((cosd(theta(i)))^2);

This error is getting only If I enter the options in prompt (2 in question 4 and 2 in question 5). For remaining options its working I dont know why.

Please check it.

Thanks in advance.

[Cris LaPierre]

The error message is fairly easy to understand. For the condition you specify, you do not define theta. This pertains to the code between lines 138 and 170 in the updated file.

[Sairama Krishnam Pothuri]

Hi Cris Lapierre,

Thank u so much. It worked now.