# Leah

### Energy Industry

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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**Content Feed**

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...

7 years ago | 0 answers | 1

### 0

answersHow to add folder automatically

This will create one in the working directory foldername='newfoldername' mkdir([pwd '\' foldername])

7 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....

7 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...

7 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...

8 years ago | 0 answers | 0

### 0

answersQuestion

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...

8 years ago | 2 answers | 2

### 2

answersLinearModel 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...

8 years ago | 0

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); ...

8 years ago | 1

| accepted

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 ...

8 years ago | 1

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; ...

8 years ago | 0

Eigenvalue Decomposition of Matrix that doesn't fit in memory

Not really, maybe principle component analysis is a better option.

8 years ago | 0

Using a loop to write to excel

Count is not a cell array but you reference it as one using {i}

8 years ago | 0

| accepted

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...

8 years ago | 0

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...

8 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...

8 years ago | 2 answers | 0

### 2

answersQuestion

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...

8 years ago | 5 answers | 1

### 5

answersQuestion

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. ...

8 years ago | 0 answers | 0

### 0

answersfinding 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...

8 years ago | 0

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 ...

8 years ago | 6

| accepted

How to make a 4D graph

http://www.mathworks.com/help/matlab/ref/scatter3.html check out vary marker color

8 years ago | 1

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...

8 years ago | 0

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...

8 years ago | 1

'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...

8 years ago | 0

| accepted

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...

8 years ago | 0

| accepted

Displaying gif Image in Matlab

[I cmap] = imread('image_name.gif','frames','all'); image(I); colormap(cmap);

8 years ago | 2

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....

8 years ago | 1

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?" ...

8 years ago | 0

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...

8 years ago | 0

| accepted

Problem with detection of multicolinearity in a matrix

would a correlation matrix help you out? RHO = corr(X)

8 years ago | 1

Concatenating a double array and two cell arrays

does this work sitedata=horzcat(a, b, num2cell(site_Cflux))

8 years ago | 0

| accepted