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# Jonathan Sullivan

### MIT Lincoln Laboratory

173 total contributions since 2011

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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...

más de 2 años ago | 0

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...

casi 5 años ago | 1

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Question

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...

más de 6 años ago | 0 answers | 0

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

más de 6 años ago | 1

Weighted markers for scatter plot
help scatter

más de 6 años ago | 0

help atan2 doc atan2

más de 6 años ago | 0

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...

más de 6 años ago | 0

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 ...

más de 6 años ago | 0

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...

más de 6 años ago | 2

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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...

más de 6 años ago | 0

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...

más de 6 años ago | 0

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...

más de 6 años ago | 0

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

más de 6 años ago | 0

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...

más de 6 años ago | 0

Just sort the list of file by date before doing anything with them. Example % Get the files in the directory wd='C:...

más de 6 años ago | 0

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

más de 6 años ago | 0

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...

más de 6 años ago | 0

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

más de 6 años ago | 1

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

más de 6 años ago | 0

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

más de 6 años ago | 0

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...

más de 6 años ago | 0

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

más de 6 años ago | 0

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

más de 6 años ago | 1

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...

más de 6 años ago | 1

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...

más de 6 años ago | 0

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

más de 6 años ago | 0

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 ...

más de 6 años ago | 1

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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...

más de 6 años ago | 0

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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...

más de 6 años ago | 0