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John Billingham


University of Nottingham

Last seen: 5 months ago |  Active since 2014

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Professor of Theoretical Mechanics School of Mathematical Sciences The University of Nottingham UK Professional Interests: Scientific computing

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Why does fmincon using the sqp algorithm need a full matrix to specify linear constraints?
I need to specify that some of the variables in my optimization need to be ordered, so v_i-v_(i+1)<0 for i = N_1 to N_2. This ...

1 year ago | 2 answers | 1

2

answers

Question


Spline with clamped end conditions using griddedInterpolant
I can create a piecewise polynomial spline with clamped end conditions from vectors x and y using pp = spline(x,[dy1 y dy2]) ...

2 years ago | 1 answer | 0

1

answer

Question


How can I clear persistent variables from a function using only its handle?
For example, say I have a simple function, _test1_, function test1 = test1(x,y) persistent k if isempty(k), k = sum(y); e...

7 years ago | 2 answers | 0

2

answers

Question


How can I create an ordinary floating point function from a symbolic array
If I have some code that generates a symbolic array, I'd like to be able to turn it into a function that takes floating point in...

7 years ago | 1 answer | 0

1

answer

Solved


The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

9 years ago

Question


How can I use zlib in a C mex file and use gz compression?
I need to use zlib to do gz compression within a C mex file. Something like #include < zlib.h > gzFile fi = gzopen(f...

9 years ago | 1 answer | 0

1

answer

Question


How can I convert individual guis into a single tabbed gui?
I have a gui that pops up another gui when a button is pressed. I'd like to convert this into a single gui with two tabs. Can an...

9 years ago | 1 answer | 0

1

answer

Question


Is it impossible to use OpenMP in mex files with the only free C++ compiler that's compatible with MATLAB (Microsoft SDK 7.1)?
Really?

9 years ago | 1 answer | 1

1

answer

Question


Accessing a cell array of cell arrays in a C++ mex file
I'm writing a large code that requires me to use a cell array of cell arrays of single precision real matrices. This may seem od...

10 years ago | 1 answer | 0

1

answer

Question


Problem with simplify(x^(1/log(x)).
>> sym x; >> assume(x>0) >> simplify(x^(1/log(x)),'IgnoreAnalyticConstraints',true) >> ans = x^(1/log(x)) Note that x^(1/...

10 years ago | 1 answer | 0

1

answer

Question


Struggling to distribute a cell array across several parallel workers
I have some code, part of which a structure of the form below. for a = 1:A for b = 1:B for c = 1:C f...

10 years ago | 0 answers | 0

0

answers

Question


Finding parfor baffling: Can anybody explain to me why this little bit of code works with for,but not with parfor?
function B = partest A = 1:4; B = zeros(1,4); parfor j=1:2 B([j j+2]) = A([j+2 j]); end The...

10 years ago | 2 answers | 2

2

answers