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Leah


Energy Industry

139 total contributions since 2010

10+ years of MatLab experience
Always interested in teaching others and learning new tricks.
Datasets changed the way I program in MatLab, I love them.
Professional Interests: Time series, Numerical Analysis, Forecasting, Option Pricing, Econometrics, Image Processing

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Question


webread not working for JSON
I can read from url's and api's just fine as long as the return format is not JSON. Some examples from matlab help that don't wo...

2 years ago | 0 Answers | 1

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How to add folder automatically
This will create one in the working directory foldername='newfoldername' mkdir([pwd '\' foldername])

2 years ago | 0

Linked


Cheat sheet for new tables compared to dataset notation
I've been creating this cheat sheet as I learn the new notation. I will try to update.

2 years ago | 31 clicks |

Solved


Length of the hypotenuse
Given short sides of lengths a and b, calculate the length c of the hypotenuse of the right-angled triangle. <<http://upload....

3 years ago

Solved


Is this triangle right-angled?
Given three positive numbers a, b, c, where c is the largest number, return *true* if the triangle with sides a, b and c is righ...

3 years ago

Question


dataset join between date range
I know how to do this in SQL but I can't think of the best way to accomplish it in matlab. I need to do is repeat the value for...

3 years ago | 0 Answers | 0

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Question


Fill NaNs in array with last value
Hi all, thanks for your help. I have a double array and I want to fill NaN values with the last value. Example: [321 na...

3 years ago | 2 Answers | 2

2

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LinearModel custom class questions
I think in order for you to have all the functionality of the class you need to keep the variable information. Can you just copy...

3 years ago | 0

Answered
Removing entries of vector indexed by odd integer.
You just have to reference every other element of the vector you created. x=linspace(1.4, -3.5, 101) ; y=x(1:2:end); ...

3 years ago | 1

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Answered
Issue with Cholesky decomposition and positive definiteness
I used Spectral decomposition when this happens. Which is just a fancy name for setting the negative eigenvalues to zero before ...

3 years ago | 0

Answered
LinearModel.fit results to array
I was able to do it, i made a dataset mid to hold everything md = LinearModel.fit() mid.RsqAdj=md.Rsquared.Adjusted; ...

3 years ago | 0

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Eigenvalue Decomposition of Matrix that doesn't fit in memory
Not really, maybe principle component analysis is a better option.

3 years ago | 0

Answered
Using a loop to write to excel
Count is not a cell array but you reference it as one using {i}

3 years ago | 0

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How to use radio buttons more effectively in a button group?
In the radio button group callback you will need to either clear the axes or overwrite the data being displayed inside the obje...

3 years ago | 0

Answered
Data vusualization - How to align data sets?
I would probably do the circshift function and search for the highest correlation. But if the first minimum works wells then sti...

3 years ago | 0

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Question


count of months spanned
I can't think of a way to do this without a loop. I have a bunch of start and end dates. Each row is a record and I want to be a...

3 years ago | 2 Answers | 0

2

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Question


Have you seen this blog on MATLAB?
There is some serious MATLAB hate going on here. I'm not sure what they want you to abandon MATLAB for... maybe a combination of...

3 years ago | 3 Answers | 1

3

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Question


SAP OLAP Database connection
I am looking to connect to SAP BW or OLAP. They have several methods. The java SDK is not an option because of internal issues. ...

3 years ago | 0 Answers | 0

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finding x and y coordinates of the image and spline fit
You have to define the coordinate system then decide which points you want to use for interpolation. Why are you after an equati...

3 years ago | 0

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How do you create an empty N*M matrix
hmmmm empty you can do ones ones(3,3) or nan nan(3,3) or zero zeros(3,3) or identity eye(3,3) ...

3 years ago | 2

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Answered
How to make a 4D graph
http://www.mathworks.com/help/matlab/ref/scatter3.html check out vary marker color

3 years ago | 1

Answered
PlotYY X axis doubled
you can turn it off by then you won't know if your xaxis consistent for each y axis. it's best to make them match turn off (n...

3 years ago | 0

Answered
Generating random numbers from normal distribution
Yes you can do this you just need the right transformation. You cannot generate a bounded normal distribution. It needs to be de...

3 years ago | 1

Answered
'x10^5' show up in MATLAB plots
There is a x-axis for each y-axis so you need to change the formatting on both of them not just the current one (gca) [AX,H1...

3 years ago | 0

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Answered
Export several arrays with the same name to a xls
This will work up to the Z column in Excel (26 mat files) I don't know how many mat files you have. mat_files=1:26; %number...

3 years ago | 0

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Answered
Displaying gif Image in Matlab
[I cmap] = imread('image_name.gif','frames','all'); image(I); colormap(cmap);

3 years ago | 2

Answered
Experiences with release 2013a
I love the new linear regression class. Very powerful combined with datasets. It has made things much easier and cleaner for me....

3 years ago | 1

Answered
How to rearrange the rows of a matrix so the column values loop
"If you only want them to be counter-clock wise, why not convert the [x,y] point to polar coordinate and sort them by angle?" ...

3 years ago | 0

Answered
How do you connect to a remote machine in MatLAB?
if the remote machine has been configured for sharing you should be able to map a network drive and write to a folder on the rem...

3 years ago | 0

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Answered
Problem with detection of multicolinearity in a matrix
would a correlation matrix help you out? RHO = corr(X)

3 years ago | 1

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