# Darcy Cordell

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**Feeds**

Question

How does indexing work when sorting a matrix?

My intuition is clearly off on this and any help is appreciated. For a vector, if you sort the vector and find the indices of t...

2 months ago | 3 answers | 0

### 3

answersQuestion

Help designing very low pass filters (sub-mHz) for long time series

I am relatively new to filter design so patience is appreciated. I have an extremely long time series (e.g. ~100 million data p...

3 months ago | 2 answers | 0

### 2

answersQuestion

Why is str2num not recommended when it is faster in certain circumstances?

I have a cell array of millions of strings representing dates with the format "yyyyMMddHHmmss" I need to convert these to datet...

3 months ago | 2 answers | 0

### 2

answersQuestion

How to "flatten" parts of a MATLAB image (e.g. basemap) to save space when saving as a vector image?

I often make plots in MATLAB and then save as vector images (eps format) so that I can do further editing if needed in Adobe Ill...

4 months ago | 1 answer | 0

### 1

answerQuestion

Why is it so difficult to add basemaps in the Mapping Toolbox?

I have been a bit frustrated by the MATLAB mapping functionality because it seems like the "mapping" functions are often not com...

4 months ago | 0 answers | 1

### 0

answersQuestion

How to normalize an image position in a subplot?

I have some data which I then overlay a figure on top of like this: plot(rand(10),rand(10),'*') [img,~,alphachannel] = imrea...

5 months ago | 1 answer | 0

### 1

answerQuestion

Where is the month, day and year string stored in a plot with a datetime axis which shows hours and minutes in the xticklabel string?

A somewhat specific question which I cannot find the answer for. Suppose I have some random data measured at different times wh...

9 months ago | 2 answers | 0

### 2

answersQuestion

How to generate three figures to fill the screen (distributed vertically)?

This should be a very simple problem but I'm not sure if I've done something simple and wrong, or if there is some strange buggy...

11 months ago | 2 answers | 0

### 2

answersQuestion

Removing white space on pcolorm plots (for irregular rotated mesh)

My question is very similar to this one: https://www.mathworks.com/matlabcentral/answers/275814-white-space-in-map-grid To summ...

1 year ago | 1 answer | 0

### 1

answerQuestion

How best to convert a (lat,long) network into a "line diagram" in MATLAB?

I have a transmission network with substations in (lat,long) coordinates connected by transmission line segments. I want to plot...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to assign elements in a vector to an entry in a structure array variable?

I have an Nx1 structure array which contains a variable: N = 100; S(1).Name = 'Jon'; S(2).Name = 'Phil'; S(3).Name = 'Bob'; ...

1 year ago | 3 answers | 0

### 3

answersQuestion

How to access only the first element of the variables in a structure array as a vector?

Not sure I worded this question correctly, but I will try to explain. I have a (1 x N) structure array (S) which contains the f...

1 year ago | 1 answer | 0

### 1

answerQuestion

New to filter design: Designing filters at very low frequencies (mHz) on logarithmic frequency scale

I am new to filter design, and I am trying to filter some signals to analyze the frequency content. I would like to look at low-...

1 year ago | 1 answer | 0

### 1

answerQuestion

Faster interpolation of 2-D spatial data at different time steps without looping through the time steps?

I have a relatively small number of scattered data point locations (~30) which I want to interpolate onto a uniform spatial grid...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to save a fig file and re-open it with the same figure number?

Very simple question which I cannot find a simple answer to: If I save a figure with a particular figure number as a *.fig file...

2 years ago | 1 answer | 0

### 1

answerQuestion

Matrix multiplication along a specified dimension?

I have a 2x2xN matrix, A, and a 2xN matrix, X. I want to multiply each Nth 2x2 matrix in A by the Nth 2x1 matrix in X. I can do ...

2 years ago | 1 answer | 0

### 1

answerQuestion

How can I insert many columns into a matrix at different locations efficiently?

I have a matrix in which I need to delete several columns of zeros, perform some operation (i.e. matrix inverse), and then re-in...

2 years ago | 1 answer | 0

### 1

answerQuestion

Is there an easier way to index diagonal elements of a matrix?

Let's say I have a 10 x 10 diagonal matrix of random integers between 0 and 100: A = diag(randi(100,10,1)); I want to replace ...

2 years ago | 2 answers | 0

### 2

answersQuestion

How to convert an image back to a data matrix?

I have a color PNG figure with contours which displays some data matrix as a colorplot. The figure was made elsewhere and cannot...

2 years ago | 1 answer | 0

### 1

answerQuestion

How can I stop my Mac showing a new figure window on MATLAB while I am doing something else?

This seems like a very specific weird question that I can't find an answer to anywhere else. I am making lots of figures in MAT...

3 years ago | 1 answer | 1

### 1

answerQuestion

How can I get randperm to return a permutation of a vector that has no entries at their original positions?

I want take a random permutation of a vector such that all entries of the vector move to a new location. For example, if I have...

3 years ago | 5 answers | 0

### 5

answersQuestion

Why does pcolor require you to transpose the matrix when you give it x and y vectors?

Suppose you have an M by N matrix of data called A. Associated with that data is a vector in the x-direction with length M and a...

4 years ago | 2 answers | 0

### 2

answersQuestion

Why does pcolor not display the full matrix?

There are several questions on here asking why pcolor does not display the full matrix. Most answers say something along the lin...

4 years ago | 1 answer | 0

### 1

answerQuestion

Rendering EPS figures in MATLAB 2020 different than older versions?

I recently updated from MATLAB 2016 to MATLAB 2020a. I am trying to recreate certain EPS figures exactly and then import those ...

4 years ago | 0 answers | 0

### 0

answersQuestion

Formatting fread binary file (converting from FORTRAN script)

I am converting some Fortran to MATLAB and am stuck early on when trying to load a binary file. I know MATLAB well but I have no...

4 years ago | 0 answers | 0

### 0

answersQuestion

Why does "tic/toc" output time info before my figure has plotted?

I am using a function to plot a somewhat complicated figure with many subplots and lots of data. I noticed that there was a bit...

4 years ago | 1 answer | 0

### 1

answerHow to get geoshow to fill inside a polygon rather than outside?

Fix found here: https://www.mathworks.com/matlabcentral/answers/379817-shapes-displayed-incorrectly-using-geoshow-mapping-toolb...

4 years ago | 0

Question

How to get geoshow to fill inside a polygon rather than outside?

I am using geoshow to plot filled polygons on a map. The polygons represent lakes. I have latitude and longitude coordinates sav...

4 years ago | 1 answer | 0

### 1

answerQuestion

What is the kstest2 in MATLAB doing to compute the empirical distribution function?

According to Wikipeda, to compute the 2-sample Kolmogorov-Smirnov test, you first compute the empirical cumulative distribution ...

6 years ago | 0 answers | 0