Community Profile

# Dingyu Xue

### Northeastern Univ

28 total contributions since 2000

Professor, Control Engineering
Faculty of Information Science and Engineering

Professional Interests: control theory, simulation, MATLAB in education

Contributions in
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Question

problems in accuracy assessment
Dear friends I tried continued fractiona approximation to pi, and got the following rational approximation 124496998874578...

2 years ago | 1 Answers | 1

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Posted

Need a function like isnumeric
Dear friends. I need a function like isnumeric, which returns 1 with both thefunction(sym(pi)), and thefunction(pi), and returns...

2 years ago | 1741 views

Question

A possible bug in symbolic limit function regarding complex entities?
The code I tried >> syms z; F=1/(z-1)^2+3/(z-1)+5/(z+1i)+6/(z-1i)^2+1/(z-2)^2+1/(z-2) % original function, f1=(z...

2 years ago | 0 Answers | 0

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Posted

Problems in Simulink to eps file printing in new versions
Dear colleagues, Probably from MATLAB 2012b, the exporting of Simulink to eps file is changed. The following command is OK bor ...

3 years ago | 975 views

Question

Dear colleagues Probably from MATLAB 2012b, the exporting of Simulink to eps file is changed. The following command is OK bor e...

3 years ago | 0 Answers | 0

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Submitted

OptimPID is a MATLAB based interface and it can be used to optimize PID parameters

Responded

Thanks for consideration, problem SOLVED. Instead of the old Mask Entries parameter, the new one changed to set_param(sys,'MaskV...

6 years ago | 1630 views

Responded

I tried and it works on 2008a, how about other version and what is the solution to 2010a? Thanks

6 years ago | 1630 views

Posted

In earlier version of MATLAB, I used the command set_param(sys,'Mask Entries',['5 \/ 6 \/ 7']) to set the parameters in the mas...

6 years ago | 1630 views

Posted

Dear friends I am not able to print the correct Simulink model to a eps file correctly with the recent two versions, 2009b and 2...

6 years ago | 1574 views

Responded

For linear MIMOs, two ways: 1) Establish the model from definition. y1=g11u1+g12u2 y2=g21u1+g22u2 2) convert it to state space m...

7 years ago | 1870 views

Responded

Re: Extended Symbolic Toolbox, code not working under new versions
Ben Hinkle" <bhinkle@mathworks.com> wrote in message but now you're trying to and not the number call that creates Maple 8 (w...

8 years ago | 2809 views

Posted

Repetitive computations (Looping)
say, your d=5:5:pi/2 command may generate an empty vector, the colon expression should be: d=start:step:end, as I understand, i...

8 years ago | 1321 views

Responded

Re: strange results
felix.goldberg@gmail.com wrote in message polynomials. For p=[[1,0,-73,-336,596,11312,54236,157040,318318,478192,546546,480272,3...

8 years ago | 678 views

Posted

Extended Symbolic Toolbox, code not working under new versions
The following codes used to run in earlier versions, but now it is not working under 2007b, 2008a maple('with(numtheory):'); f=...

8 years ago | 2809 views

Posted

Repetitive computations (Looping)
Esuene SAMSON" <esuene.samson.nospam@example.com> wrote in message <ftcr1o\$4o0\$1@fred.mathworks.com>... also check your b,c,d ve...

8 years ago | 1321 views

Posted

Repetitive computations (Looping)
Esuene SAMSON" <esuene.samson.nospam@example.com> wrote in message <ftcr1o\$4o0\$1@fred.mathworks.com>... if I am solving the prob...

8 years ago | 1321 views

Posted

Repetitive computations (Looping)
Esuene SAMSON" <esuene.samson.nospam@example.com> wrote in message <ftcr1o\$4o0\$1@fred.mathworks.com>... if I am solving the prob...

8 years ago | 1321 views

Posted

Repetitive computations (Looping)
Esuene SAMSON" <esuene.samson.nospam@example.com> wrote in message <ftcr1o\$4o0\$1@fred.mathworks.com>... if I am solving the prob...

8 years ago | 1321 views

Posted

Repetitive computations (Looping)
Esuene SAMSON" <esuene.samson.nospam@example.com> wrote in message <ftcr1o\$4o0\$1@fred.mathworks.com>... if I am solving the prob...

8 years ago | 1321 views

Posted

Repetitive computations (Looping)
Esuene SAMSON" <esuene.samson.nospam@example.com> wrote in message <ftcr1o\$4o0\$1@fred.mathworks.com>... if I am solving the prob...

8 years ago | 1321 views

Responded

Re: How to get sqrt(x + i*y) two roots?
So far, the problem is restricted to square roots of a complex number. I am happy to add more: if A is a matrix and we are expe...

8 years ago | 1345 views

Responded

Re: A bug in the spline box?
thank you are right. I did have a ppual in another version in a toolbox

9 years ago | 1214 views

Posted

A bug in the spline box?
Version 2007a tried the command in menual for 2d splines x =.0001+[-4:.2:4]; y = -3:.2:3; [yy,xx] = meshgrid(y,x); r = pi*sqrt(x...

9 years ago | 1214 views

Submitted

Feedback Control Systems
Companion Software

Submitted

Improved Algebra files
Comput roots and polynomial functions with high accuracy.

Submitted

CtrlLAB
CtrlLAB provides a graphical interface to perform feedback system analysis and design.