Jonathan Sullivan

MIT Lincoln Laboratory

Active since 2011

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Answered
Best method for identifying the color
Think of the color of a pixel being a vector in a 3 dimensional space. What you want to do is find the angle of the color vector...

presque 5 ans ago | 0

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table for string
You'll need to make you table a cell array. Try this: a = 12345; b = num2str(a); Table{1} = b; % Notice the curly brackets...

plus de 7 ans ago | 1

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Question

Retaining Minor Grid Status Upon Loading a Saved Figure
I seem to be running into an issue that I can't seem to solve. I can't seem to save the state of the minor grid lines. I'll make...

presque 9 ans ago | 0 answers | 0

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answers

Answered
how to put heading for columns of matrix?
If you have MATLAB 2013b, I would look into using tables doc table

presque 9 ans ago | 1

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Weighted markers for scatter plot
help scatter

environ 9 ans ago | 0

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please help with this function
help atan2 doc atan2

environ 9 ans ago | 0

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Is there an easy way to find the radius of curvature of a series of points?
Yup. There are a few solutions on the file exchange. For 2D lines try this <http://www.mathworks.com/matlabcentral/fileexchan...

environ 9 ans ago | 0

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Problem with a for loop
It's much easier than this. The function *mean* allows you to specify a dimension over which to operate. For you, you would ...

environ 9 ans ago | 0

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How can I reshape a 3D matrix without changing the order of the data
Use the function *permute*. It switches the order of the dimensions. You would want something like: A = permute(A,[3 1 2...

environ 9 ans ago | 2

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Answered
Copy file from one network computer, to another
Not really. If you want to bypass your machine you'll need to execute the command on either the source or the destination machin...

environ 9 ans ago | 0

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Boolean Variables in Matlab
No. MATLAB does not have any native bit sized data types. The best you are going to be able to do is to (without creating your o...

environ 9 ans ago | 0

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How to open file array with fopen?
You just need to index into J properly. J looks to be a cell array so you need to use curly brackets. Try replacing your fope...

environ 9 ans ago | 0

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Answered
re-arrange matrix with for loop
reshape(permute(rgb,[2 1]),[],3)

environ 9 ans ago | 0

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while statements - imposing two conditions
Sounds like either *L2normpercentold* or *Diffpart1* are not scalars. How you get around this depends on what type of behavior y...

environ 9 ans ago | 0

Answered
Directory not loading in the correct order
Just sort the list of file by date before doing anything with them. Example % Get the files in the directory wd='C:...

environ 9 ans ago | 0

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Answered
How to choose the value of db(Daubechies)?
doc wfilters

environ 9 ans ago | 0

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Get location from GPS coordinates?
You will need to write a script that uses a geocoding service. <https://developers.google.com/maps/documentation/geocoding/ Goo...

environ 9 ans ago | 0

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Answered
How to copy one image to another (blank) pixel by pixel?
You should try this: Xc = imread('IM1.jpg'); blank = Xc; imshow(blank);

plus de 9 ans ago | 1

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Indexing negative and positive elements of a vector
help sign doc sign

plus de 9 ans ago | 1

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Answered
Fitting Lorentzian curve to noisy data
You many want to try this: <http://www.mathworks.com/matlabcentral/fileexchange/33775-lorentzian-fit>

plus de 9 ans ago | 0

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How to find x,y matrix using for sintax
It's really simple if you use the functions *find* and *any*. See below: ind1 = find(any(x == 1,2),1); ind2 = find(any...

plus de 9 ans ago | 0

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Error in my code
Just do MAT(MAT == 0) = 6;

plus de 9 ans ago | 0

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Answered
How can I randomly select a row from a matrix?
Try using *randi* Example randomRow = m(randi(size(m,1)),:);

plus de 9 ans ago | 2

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to find the missing date and time in the time series data?
# Convert the dates to a date number using *datenum*. # Take the difference using *diff*. # Find the outliers by comparing the...

plus de 9 ans ago | 1

Answered
Pulling .mat files from multiple directories in one function
When you call load, you are not referencing them by their file name only (i.e. no directory). Try something like this: func...

plus de 9 ans ago | 0

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Answered
Using regexp to capture parts of a filename
Your slash is the wrong way. Try: experimentName =regexp(str,'DD2CM(\d*)','match')

plus de 9 ans ago | 0

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Delete letters in a string variable
To detect which charectors are letters, you can use the function *isletter*. Then just simply delete the ones that are letters ...

plus de 9 ans ago | 1

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Answered
If statement for a values in a string
The variable *h* does appear to be a string, but rather a vector of doubles. What you want to use to determine if a scalar is eq...

plus de 9 ans ago | 0

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Answered
Load mat files located path into a function
Not sure if I understand your problem, but it sounds like you want the data in your mat file loaded as variables in the workspac...

plus de 9 ans ago | 0

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compare loops and matrix computation.
This has some good information on the topic: <http://www.mathworks.com/help/matlab/matlab_prog/vectorization.html>

plus de 9 ans ago | 0

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