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# Shuang

11 total contributions since 2012

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Question

Is stepwisefit the exact implementation of stepwise regression?
Hi all. I looked into the stepwisefit function and got a doubt that this function may not be the exact implementation of stepwis...

3 months ago | 1 Answers | 0

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Question

question on saturation of integrator
Hi, I am setting up a simple model to test the saturation on an integrator. The source is a sin wave with amplitude 5, that is 5...

3 years ago | 0 Answers | 0

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Question

I am study an example provided in Simulink "Performance of Three PSS for Interarea Oscillations" I found in this example when...

3 years ago | 1 Answers | 0

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Question

Zero impedance of transmission line of 4 machine 2 area Kundur's system
Hi all Can anybody tell me how the tansmission line zero impedance comes out in the matlab simulink example:Performance of Th...

3 years ago | 0 Answers | 0

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Question

What does the percentages of each frequency mean in the fft tool analysis GUI?
Hi all, Does the percentage mean THD? So the magnitude of each frequency component can not be calculated by just timing the p...

3 years ago | 0 Answers | 0

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Posted

Problem :matrix is close to singlar or badly scaled
Hi all, I have a problem in solving a pde function ur*(partial delta/partial x)^2-ux*(partial^2) delta/(partial ^2)x+2*sqrt(ur...

4 years ago | 975 views

Question

Numercial Probelm: matrix is close to singlar or badly scaled
Hi all, I have a problem in solving a pde function ur*(partial delta/partial x)^2-ux*(partial^2) delta/(partial ^2)x+2*s...

4 years ago | 0 Answers | 0

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Posted

Matrix is close to singular or badly scaled
Hi all, I have a problem in solving a pde function ur*(partial delta/partial x)^2-ux*(partial^2) delta/(partial ^2)x+2*sqrt(ur*...

4 years ago | 2079 views

Question

Problem of Differential Algebraic Equations in Matlab
Hi all, I have written a program in order to solve for 128 differential equations and 64 algebraic equations. I use the ode23...

5 years ago | 1 Answers | 0

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why cannot I get the figure by ezplot?
I tried to add wks=simple(wks)and wkt=simple(wkt)into the program and use wkt=ilaplace(wks) instead of wkt=ilaplace(sym('wks')) ...

5 years ago | 0

Question

why cannot I get the figure by ezplot?
Dear all, I wrote a program to plot the inverse laplace transform of a function wks, matlab can calculate it fast. But it is ...

5 years ago | 2 Answers | 0