Math Forum / Math Software / MATLAB

Can any one please help me to implement diffusionmap algirthm for finding the
diffusion distance. Suppose I have a gray image and which is having size
25x25. here each pixel considered as a node in graph.
thanks

Can any one please help me to implement diffusionmap algirthm for finding the
diffusion distance. Suppose I have a gray image and which is having size
25x25. here each pixel considered as a node in graph.
thanks

HI !
I am using one of the tool boxes  (http://www.eecs.umich.edu/~fessler/irt/irt/nufft/) where they tested their algorithm with uniform frequency locations and non uniform frequency locations
om = 2*pi*sort(rand(No,1)-0.5);        % random frequency samples on [-pi,pi ]
om = ...

I am having problems with my simmechanics model. The model is kind a like a flight simulator (Stewart platform like Matlab example) only with some differences. So it has a body which is carried by 6 legs forming 3 'diamond shaped' supports with only revolute joints.
The problem is ...

Hi,
I would like to know if there is any method by which I could convert optimset and fminsearch functions into a C/C++ code. Since i need to parallalize my code I need to convert these functions.
Any help would be really appreciated.
Regards,

Iam trying to solve no. of non linear equations using fsolve but I am faced
the following error!!!
Maximum number of function evaluations reached:
increase options.MaxFunEvals.

See Subject. Actually, my interest is in updating non-linear models
whose data might be collected in batches. None of it is time related in
the sense of observations occurring in a time ordered sequence. It's a
situation where it takes hours to collect and build the model, then ...

I'm using the pdist function to calculate the distances between a set of points. The results are transformed into SQUAREFORM and the FIND function used to determine the row and column of the minimum nonzero distances (or distances below user-defined threshold). Of course, when ...

I want to be able to store Matlab variables as binary data in a BLOB column in a mysql database, then retrieve them. How should I go about doing this?
I tried using the fastinsert function like so:
fastinsert(connection,{'blob_column'},Variable_To_Be_Inserted)
but received a 'mysql ...

Hello,
My problem is the following. I'm measuring the I V curve for a solar cell. So that, I get 2 arrays (one is V and the other is I).
Now I know that the integral Int(I,V)= cumtrapz(V,I-Io) can be expressed as an algebraic equation : Int2=a*V+b(I-Io)+c(I-Io)*V+d*V²+e*(I-Io)²
To ...

I'm new to Matlab, and needs some help on something quite basic I think.
That's probably the reason I had problems finding anything about it...
I have 3 columns/vectors imported from excel that i want to make a contourf
or a pcolor plot of.

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I am a new user of matlab's mex files. I am trying to call a C++ file but I get errors related to the gsl matrices. I am using -lgsl -lgslcbla to compile it but no success up to now.
Any help would be appreciated.
Thanks

I have been trying to run a monte carlo simulation of a simple
simulink model - digital modulation schemes (BPSK, QPSK,
QAM). For some unfathomable reasons, I keep getting a
horizontal plot rather than the expected water fall plot in