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Leah


Energy Industry

Active since 2011

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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...

10 years ago | 0 answers | 1

0

answers

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

10 years ago | 0

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....

11 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...

11 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...

11 years ago | 0 answers | 0

0

answers

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...

11 years ago | 2 answers | 2

2

answers

Answered
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...

11 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); ...

11 years ago | 1

| accepted

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 ...

11 years ago | 1

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; ...

11 years ago | 0

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

11 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}

11 years ago | 0

| accepted

Answered
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...

11 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...

11 years ago | 0

| accepted

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...

11 years ago | 2 answers | 0

2

answers

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...

11 years ago | 3 answers | 1

3

answers

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. ...

11 years ago | 0 answers | 0

0

answers

Answered
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...

11 years ago | 0

Answered
How do you initialize an N*M matrix?
To initialize an N-by-M matrix, use the “zeros” function. For example, create a 3-by-5 matrix of zeros: A = zeros(3,5); You ...

11 years ago | 7

| accepted

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

11 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...

11 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...

11 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...

11 years ago | 0

| accepted

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...

11 years ago | 0

| accepted

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

11 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....

11 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?" ...

11 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...

11 years ago | 0

| accepted

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

11 years ago | 1

Answered
Concatenating a double array and two cell arrays
does this work sitedata=horzcat(a, b, num2cell(site_Cflux))

11 years ago | 0

| accepted

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