Matlab

merging matrices in loop
Hey, I have a function that generates a data matrix e.g. 7x8 I use this function in a loop and I want to have all output data in one big matrix. it looks like that for i=1:10 [data]=function_name end so when for i=1 i get one large data matrix e.g. 7x8 and for next i value I gen another data matrix e.g. 12x8... 25 Jun 2010 15:22

Delaunay/interpolation from triangular mesh
Hello, I have a situation where I would like to build a 2-D Delaunay triangulation from scattered points (x,y), and then interpolate to a regular grid. The hook is that I would like to do the triangulation once and the be able to use that for a range of arrays for z: tri = delaunay(x,y); [X,Y] = meshgrid(linspace(... 24 Jun 2010 16:21

Boxplot question`
Can someone explain how to group data into a defined interval range for boxplots? For example, we have a 100x2 temperature matrix and we'd like to group the data into 2 degree non-overlapping intervals based on the first column. We can do it manually like this, but it's kind of clunky. Is there a more general soluti... 24 Jun 2010 15:14

Spline Interpolation Problem
Hello, I have a set of 3-D data (x,y,z) that correspond to a curve in 3-space. My task is to find a function that fits this data so that I may interpolate the data at user-defined points. I am lost as how to extract this information from a spline. Also, I have tried John D'Errico's function polyfitn with undesir... 24 Jun 2010 14:08

block processing problem
"Royi Avital" <RoyiREMOVEAvital(a)yahoo.com> wrote in message <ht87at$u9$1(a)fred.mathworks.com>... Parker <xenoszh(a)gmail.com> wrote in message <d7dbddd0-5571-4ec4-8183-e5f76a31edb8(a)f14g2000vbn.googlegroups.com>... On May 21, 9:57 pm, Parker <xeno...(a)gmail.com> wrote: The old version of block processing in M... 24 Jun 2010 14:08

removing multiple elements from an array
Why is this better than the [] deletion method? Thanks! "Erica B" <ebickford(a)wisc.edu> wrote in message <h220kv$5rd$1(a)fred.mathworks.com>... "Greg von Winckel" <see(a)signature.com> wrote in message <ef57aa2.3(a)webcrossing.raydaftYaTP>... One other possible solution A=A(setdiff(1:length(A),ind)); ... 24 Jun 2010 14:07

array manipulation
hello every body, I need help. I am running a loop for 1000 times. In the middle I want to store the result calculated before the loop repeats. I dont know how to assign the values to an array so that how all the values are stored for later use. thanks in advance ... 24 Jun 2010 15:14

Invoking a pushbutton - without pushing it...
Consider a situation where a GUI includes a pushbutton that executes some code associated with a callback function that is nested in the GUI function. Does there exist a mechanism that would allow one to execute the callback code via an external command so that the callback executes as though the button had actually be... 24 Jun 2010 17:28

expm
My problem involves solving the matrix exponential for a VERY large sparse matrix. A colleague suggested that I try putting my matrices in the sparse format. As a test, I recorded the time it took for expm() to compute the matrix exponential for 20 randomly generated, 1000x1000 sparse matrices passed to expm() in bot... 25 Jun 2010 23:01

Undefined function or method
Hello, I am also getting the same error message for 'finv' ??? Undefined function or method 'finv' for input arguments of type 'double'. Its funny cause its in a code that was working all fine couple of months ago. And now it gives me that error message if i type which -all finv it gives me C:\Pro... 24 Jun 2010 15:14