comp.soft-sys.matlab Google Group

Re: fk-filter, velocity filter, frequency-wavenumber filter

2010-03-12T21:44:24Z

I've transformed my matrix into reflection seismic data format and loaded it into processing software.
There is a tool, that performs a f-k transformation and plots a f-k diagram.
In this diagram You can mark an area in the f-K domain by mouse click which should be filtered out.
The result of this filtering is plotted in another window.

Re: storing values in Matlab

2010-03-12T21:35:34Z

Hi Steven..
thanks for that...it worked after swapping...

Re: Structure help

2010-03-12T21:39:24Z

Dear Jonathan!
"The first 200,000 lines of data"? So you are reading from a file? This is not shown in the code snippet. Are you sure that the assigning to the struct is the bottleneck?
Jan

indexing

2010-03-12T21:19:51Z

I have a code that generates 4 values for each iteration
i want to assign those 4 values to an array to store them and finally i want to write all those values to an excel file...all the values generated must be stored in first column of excel file..i am not sure how to index this because for each iteration it generates 4 values then they will be stored in first 4 rows of first column then for next iteration values should continue to store from 5th row of first column...

Re: how to plot cdf as scatter plot

2010-03-12T21:27:03Z

I didn't see anyone try to answer this. I have to confess I don't kow what
you mean by "category." The ecdf function does return vectors that you can
plot yourself. You could even plot them using gscatter if you have some
"category" information to code into the plot.
The best I can come up with based on your question is this:

How can I create my own workspace?

2010-03-12T21:23:05Z

Hello,
What I mean is, how can I transfer the workspace and all its variables (including loop counters and toc) from a nested function, for example, and make it available in another function?

Re: Error: Unexpected MATLAB expression

2010-03-12T21:21:23Z

Dear Will!
The code you've posted does not contain an unexpected Matlab expression.
Please post the command you use for calling the function.
What happens if you try to set a breakpoint in the M-file?
Does mlint find any problems in the file?
Jan

Matlab acker(A,B,p) method

2010-03-12T21:19:31Z

Hi, will acker method return the G matrix of Luenberger observer?
I have used this method to obtain G, then calculated the F (F = A -
G*C) and i have state space equation of Luenberger's Observer
x(t)' = Fx(t) + Bu(t) + Gy(t).
But for my object(three tanks connected in series) this observer shows
totally wrong states.

Re: storing values in Matlab

2010-03-12T21:18:46Z

You only know two values for this "function"
When x is 0.1162, the value of y is 400.
When x is 0.0977, the value of y is 405.
None of 401, 402, 403, or 404 are anywhere NEAR the values you x for which
you know y, and INTERP1 will not perform extrapolation unless you
specifically tell it to do so. Even then, trying to extrapolate that far

parfor parameter sweep with function of big matrices

2010-03-12T21:13:23Z

Hi all,
I'm having issues regarding the use of parfor for a parameter sweep that uses large matrices.
I have
original code
my_function takes as inputs the coordinates into two approximately 900x900x900 uint8 matrices.
I've been using global or appdata(set/getappdata(0,'I1') ) to load the big matrices into my_function since passing them as input is slow (about 50x slower). parfor doesn't like globals or appdata.

Re: struct element as function input

2010-03-12T21:12:22Z

The way you've done it looks fine ... the problem appears to lie inside the
import_ORYX_dts_meter.m function, not in the way you called it. Can you
show lines 1-10 of the file?
Actually, now that I think about it, if you've defined your function like:
function output = import_ORYX_dts_meter(mypath, temp.delim, dr1, dr2,

Re: Nan and Inf in princomp

2010-03-12T21:11:46Z

It sounds like you have NaN or Inf in your array. If you have NaNs
representing missing values, one option is to remove rows with NaNs.
Another is somehow to estimate the covariance and call the pcacov function
instead of the princomp function. For example, it might be possible to
combine nanvar and corrcoef, the latter using the option to compute

storing values in Matlab

2010-03-12T21:03:05Z

Hi,
i have a code that tries to find interpolated values as given below
interp1([0.1162,0.0977],[400,4 05],[401,402,403,404])
for this i am getting the output as
NaN NaN NaN NaN
please tell me what is going wrong...thanks in advance

Re: Duplicate points removed by DelaunayTri

2010-03-12T21:08:22Z

Last two code lines in the example below should have been:
F.V
F(0.75,0.5)

Re: color image watermarking

2010-03-12T21:05:30Z

This isn't really a MATLAB question, so you might receive more interest on
an image processing specific group, like sci.image.processing. If your news
server doesn't carry it, you can access it via Google groups
([link]) or other news providers.