Kevin Claytor

Con actividad desde 2012

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Professional Interests: Imaging, image processing, physics, nmr, spectroscopy

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best way to dynamically update a line handles' XData and YData?
Using the HG2 dot notation may speed things up enough for you (see <http://undocumentedmatlab.com/blog/performance-accessing-han...

más de 8 años hace | 1

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tabulate() is not working properly
It sounds like you don't have the tabulate function. This is included with the stats + machine learining toolbox. Can you paste ...

más de 8 años hace | 0

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Index of element to remove exceeds matrix dimensions.
Because you're removing elements as you go, your array gets shorter, and your fixed index (1:7) can go out of bounds. This is...

más de 8 años hace | 0

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How can I say if (A & B) or C in Matlab?
| operates elementwise on arrays. You might want to check the size of A, B, and C. _If_ then operates on the array (See @Stephen...

más de 8 años hace | 0

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How can I get the XMinorTick as a numerical value?
with ax = your axes object ax.XAxis.MinorTickValues

más de 8 años hace | 0

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Displaying MATLAB output in linux terminal
Pardon my *nix ignorance, but doesn't the & command spin off the process in a new terminal? If so it's probably dumping the mess...

más de 8 años hace | 0

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Trying to get matlab to edge detect in shadow area
Have you taken a look at the <http://www.mathworks.com/help/images/examples/correcting-nonuniform-illumination.html non-uniform ...

más de 8 años hace | 0

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User selects image in gui and selected image goes into axes??
The variable 'i' in your code is the filepath to the image, not the image itself, you still have to load the image: i = uig...

más de 8 años hace | 0

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finding a changing dominant tone in a signal
Have you tried: Raw data -> BP filter -> Spectrogram -> peak finding You seem to have the parts for it, and I would expect...

casi 9 años hace | 1

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how to calculate the intersection area of two ellipses
Here is an <http://arxiv.org/abs/1106.3787 arxiv paper> on ellipse intersection algorithms.

casi 9 años hace | 0

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Algo for finding nearest coordinates of arbitrary point along complex 3D line?
Find the minimum squared distance between the point and the line: pointX = point(1); pointY = point(2); pointZ = poin...

casi 9 años hace | 1

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Reading in ascii files with white space as delimiter.
Import data seems to work pretty well (but doesn't directly get you the headers): importdata('radiosonde.ascii', ' ', 3) ...

alrededor de 9 años hace | 0

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Problem trying to install raspberry support package
Looks like there's an <http://www.mathworks.com/matlabcentral/answers/182841-cannot-download-http-www-mathworks-com-supportpacka...

más de 9 años hace | 0

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Can I build an OCR engine from scratch using matlab?
There's no reason why you can't - just use Arabic characters as a training set for an existing OCR setup. I think the better ...

más de 9 años hace | 0

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Bining some data in 50 classes without knowing the limits
Sounds like you're trying to make a <http://www.mathworks.com/help/matlab/ref/histogram.html histogram> (hist in revisions prior...

alrededor de 10 años hace | 0

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how to get back the rgb image from r g b component ?
Exactly the opposite of how you pulled out the data; im = imread(...); red = im(:,:,1); grn = im(:,:,2); blu = im(:,:,3)...

alrededor de 10 años hace | 0

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How to use accumarray?
You could use a <http://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html Table> structure. First, I'd conve...

alrededor de 10 años hace | 0

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Error with matrix dimensions
Let's take a look at the definition of; diffHist= zeros(numFrames,1); This is a [numFrames x 1] size array. Into this yo...

alrededor de 10 años hace | 0

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substituting value in matrix does not work for some reason
Logical indexing makes this much easier; B(A==NaN) = NaN;

alrededor de 10 años hace | 0

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Create a Table with column vectors
The table data type is R2013b and above. If you upgrade, you can do something like: volts = [1:100]'; current = sin(linspa...

más de 10 años hace | 1

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Error using gop -> Error detected on worker N -> Error during serialization
I'm receiving an error running distributed code on a cluster; Error using gop (line 75) Error detected on worker 5. Error...

más de 10 años hace | 0 respuestas | 0

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how do I insert a string var in title command using LaTeX/TeX
mytitle = sprintf('\\color{red}%d \\color{blue}%f',5,pi); title(mytitle)

más de 10 años hace | 0

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How to make 2 data sets the same size
Have a look at the resample function; >> help resample resample Change the sampling rate of a signal. Y = resam...

más de 10 años hace | 0

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School may adopt Office365 and eliminate student user drives. Can students save to a cloud-based directory in MATLAB?
Why not? Dropbox just watches a local directory for changes. The only issue would be two copies of anything (Matlab, Excel, e...

más de 10 años hace | 1

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delete a subplot and renew plot
Better yet, update using handles: figure; f = 2*pi; x = linspace(1,100); y = sin(x/f); subplot(2,2,1) plot(x...

más de 10 años hace | 0

Respondida
Find summation of white pixel of detected rectangle from a binary iamge??
You're making this too complex. It's a binary image, just sum the values of your sub-image and divide by the # elements. Pseudoc...

más de 10 años hace | 1

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[HELP] How to seperate cell with values greater than 230 into new cell.
<http://www.mathworks.com/help/matlab/ref/cellfun.html cellfun> is great for operating on cells; v = {1,3,400, 3, 400, 5} ...

más de 10 años hace | 1

Respondida
Which loop to run in parallel if I have three of them?
It's going to depend. Specifically, where is the heavy lifting done? If you have code that runs fast on a single CPU, it may ...

más de 10 años hace | 0

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Passing parameters throughout nested functions
Is this in a GUI? I'd have a look at guidata() and at get/setappdata, both of which help solve the problem of handling data in G...

más de 10 años hace | 0

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Saving a figure with a textbox
Why not use text? It can still appear outside the axes; x = linspace(0,2*pi); y = sin(x); h = figure; plot(x,y); ...

más de 10 años hace | 1

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