calculate equation by giving values

rl=3.56;
L=600e-6;
C=277e-6;
D=5/18;
R=3.56;
v0=400;
w=(3-4*D)/(C*R*(1-2*D))

Gdi=(v0*(3-4*D));

Hello, I need to calculate some values in matlab. However by giving it values it executes the answer for first formula, but not the second one. Also there are other equations need to be calculated which includes square root. Anyone can help?

[Walter Roberson]

? Your code seems to calculate w and Gdi? I do not see any error or problems.

[Khumara Nasibli]

yes, it didn't show any error, it doesn't show anything

Answer 1

[Image Analyst]

Not sure what you mean. Both w and Gdi have values as you can see in the workspace panel, or by taking the semicolon off the Gdi line.

w =

4309.82030584513

Gdi =

755.555555555556

What is the second formula and what variable is it supposed to calculate that it doesn't? You can put workspace in the code if you want to make sure that panel is showing:

workspace;  % Make sure the workspace panel is showing.
rl = 3.56;
L = 600e-6;
C = 277e-6;
D = 5/18;
R = 3.56;
v0 = 400;
w = (3-4*D) / (C * R * (1 - 2 * D))
Gdi = (v0 * (3 - 4 * D))

A useful link for you to go through: Debugging in MATLAB | Doug's MATLAB Video Tutorials

And what is your third formula with the square root in it?

[Khumara Nasibli]

I'm writing down all the formulas I need:

Q=sqrt(RLC(rl+3R(1-2D)(1-D))/L+RCrl

w0=sqrt((rl+3R(1-2D)(1-D)))

Gdi=(V0(3-4D))/(rl(1-2D)+3R(1-2D)^2(1-D))

i have written formulas the way it should be, also it didn't show any error, just doesn't show any value.

[Image Analyst]

There were tons of errors in your formulas, mostly because of missing * and capitalization errors and missing parentheses. Please double check the formulas, especially the order of operation and parentheses. But the code

rl = 3.56;
L = 600e-6;
C = 277e-6;
D = 5/18;
R = 3.56;
v0 = 400;
w = (3-4*D) / (C * R * (1 - 2 * D))
Q=sqrt(R*L*C *(rl+3*R * (1-2*D) *(1-D))/L+R*C*rl)
w0=sqrt((rl+3*R*(1-2*D)*(1-D)))
Gdi=(v0*(3-4*D))/(rl*(1-2*D)+3*R*(1-2*D)^2 *(1-D))

runs and spews this out to the command window:

w =

4309.82030584513

Q =

0.101988920240641

w0 =

2.64351057273243

Gdi =

243.269026923892

but again, check the formula VERY carefully for proper parentheses. It might be better to break it up into smaller terms then combine them:

term1 = 3-4*D
term2 = C * R * (1 - 2 * D)
w0 = term1 / term2

especially for the much more compilcated Q and Gdi formulas.

[Khumara Nasibli]

it gave me somehow different results, thanks a lot.

[Image Analyst]

I can see you're a man of very few words.

Different than what? Did you try to transcribe that equation out of a paper or book?

Did you look over the parentheses locations extreeeeeeeeeeeeeemely carefully.

Did you break it down into simpler terms like I recommended?

Do you still want help or not? It sounds like not.

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