Community Profile

# Leah

### Energy Industry

124 total contributions since 2011

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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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 ...

alrededor de 1 año ago | 5

| accepted

Question

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...

casi 5 años ago | 0 answers | 1

### 0

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

más de 5 años 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....

casi 6 años 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...

casi 6 años 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...

alrededor de 6 años ago | 0 answers | 0

### 0

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...

alrededor de 6 años ago | 2 answers | 2

### 2

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...

alrededor de 6 años 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); ...

alrededor de 6 años 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 ...

alrededor de 6 años ago | 0

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; ...

más de 6 años ago | 0

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

más de 6 años ago | 0

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

más de 6 años 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...

más de 6 años 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...

más de 6 años 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...

más de 6 años ago | 2 answers | 0

### 2

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...

más de 6 años ago | 3 answers | 1

### 3

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. ...

más de 6 años ago | 0 answers | 0

### 0

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...

más de 6 años ago | 0

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

más de 6 años 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...

más de 6 años 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...

más de 6 años 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...

más de 6 años 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...

más de 6 años ago | 0

| accepted

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

más de 6 años 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....

más de 6 años 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?" ...

más de 6 años 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...

más de 6 años ago | 0

| accepted

Problem with detection of multicolinearity in a matrix