# Chris

doin' a PhD.

not good at interviews.

pessimist with a deep humanist streak.

never studied philosophy.

**Programming Languages:**

Python, C, MATLAB

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**Content Feed**

Meshgrid or other structure?

Axis_A = (-96:8:96)/2; mgrid = Axis_A+Axis_A'; would give you that matrix. As would [x,y] = meshgrid(Axis_A); mgrid = x+y;

7 hours ago | 0

How do I convert tall array duration time vector to HH:mm:ss for merging with tall array datetime vector ?

dates = tall(repmat(datetime(date),3,1)) times = tall(repmat(duration(15,12,1,345,'Format','hh:mm:ss.SSS'),3,1)) times.Format ...

1 day ago | 0

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why the plot doesn't work ,in the code i'm finding the estimation value of the phase using montecarlo simulation

since length(SNR) is 1, you are running one loop iteration and generating one point. plot() doesn't show one point unless you sp...

1 day ago | 0

Graphical Draw Path Segments

Perhaps a "bezier toolbox" with an interactive mode would be useful: https://www.mathworks.com/matlabcentral/fileexchange/69302...

1 month ago | 0

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How to produce results of script in table

Your variables are all updated in place, overwriting the previous state. You could make an array out of each variable, and upda...

1 month ago | 0

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Imresize3 not resizing in z direction?

The second method should work. Are you sure you used imresize3() and not imresize() for that? For the first method, input all t...

1 month ago | 0

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Differential Operator in Matlab in 1 Dimension

I'm not a math major so there's probably something technically wrong about this statement, but "d/dx" is essentially "dy/dx", re...

1 month ago | 1

Find the number of red marks in box plot

One method, which may not necessarily correlate to a boxplot in all situations (but probably works for the default boxplot), is ...

1 month ago | 0

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geting matlab installer to start on linux

From a comment deep in the thread (here), and from reading your symptoms, what typically works with this version of Ubuntu is: ...

2 months ago | 2

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Converting datenums to get time durations

I don't see where WaveHeight is declared, but you can calculate a duration by subtracting datetimes. ThreshDate = datetime('now...

2 months ago | 0

How can I identify the amplitude peaks from an FFT?

You can use findpeaks, probably with some additional parameters. For instance, if the plotted signal is P: Z = findpeaks(P,'Min...

2 months ago | 0

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IF Statement Help?

This statement would flow like this, for a 30-degree angle (in pseudocode): if CurrentPosition < 45 % True, so... wri...

2 months ago | 0

Help with a tiny project ( building a graph)

If I understand correctly, you only wish to plot I as a function of x. I have modified your function slightly (at the end of t...

2 months ago | 1

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Question

Why are alternative forms for "dbstop in file at location if expression" not documented?

This question is prompted by another question here. It was fairly easy to guess that dbstop('file','10') would set a breakpoi...

2 months ago | 1 answer | 1

### 1

answerUse variables in dbstop

dbstop(file,num2str(line)) Usually, functions that have input forms like dbstop has can also be called like a normal function...

2 months ago | 1

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A better way to do antidiagonal matrix vectorization?

I believe this works for tall arrays and square arrays. I haven't yet figured out how to compensate if N>M. It's not as fast as...

2 months ago | 1

A question about the efficiency of matrix multiplication in MATLAB.

Matlab was built to do matrix math first, with the highly optimized LAPACK library at its heart. That's what it's using for case...

2 months ago | 0

How can I average same-calendar-month returns over the prior 20-year period?

This is a complex question. I would answer your questions with a cell array of tables, and a whole lot of untested (because I d...

2 months ago | 0

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How do i write a line to display all the values that didn't meet the requirement

SigmaAp = 5; SigmaAx = randi(9,5,1) idxs = find(SigmaAx>SigmaAp) disp('Values over the limit:');disp(SigmaAx(idxs))

3 months ago | 0

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How to read GSI (text) file?

A = readlines('Example_of_GSI.txt'); parsed = split(A).strip('*'); Does that break it down enough for you to work with?

3 months ago | 0

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I need to find a pattern in a column

A = readmatrix('test.xlsx'); count = 0; for idx = 1:numel(A)-34 if sum(A(idx:idx+34)) == 0 count = count+1; ...

3 months ago | 0

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Livescript results in incorrect Math output

The commented-out line is: lambda_j + 2*rp*max(subs(g1,[x1;x2],x), -lambda_j/(2*rp)) lambda_j is 1. The second term (which use...

3 months ago | 0

Why shift, take absolute value and perform log transform to the frequency spectrum of an image obtained by fft2?

take the absolute value The log of a negative number is undefined, which would make for a boring image. apply a log transforma...

3 months ago | 0

Store values from a for loop in matrix and plot them.

You need an index to keep track of your loop iterations. You can do this one of two ways: idx = 0 for Prc = Prc=7:1:27 idx = ...

3 months ago | 0

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How to draw a surface starting from a 3 column vector X, Y, Z with no regular grid on X, Y ?

Another useful function is griddata

3 months ago | 0

changing the time zone for two datetime objects then comparing them

t.Date3.TimeZone = 'Asia/Dubai'; d.date.TimeZone = 'Asia/Dubai'; Works for me.

3 months ago | 0

convert python code to MATLAB

With Mie.py in your Matlab path and pyenv set up correctly, do: mie = struct(py.Mie.MieQ(1.525+0.0011j,450,300,pyargs('asDict',...

3 months ago | 0

Contour plot omitting certain points

If it bothers you, you can set caxis(min_lim,max_lim). You can include more levels by indicating the number in the function cal...

3 months ago | 0

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Increase the height (size) of subplots

If you have 2019b or newer, you can use a tiledlayout. It doesn't really show here, but there's a difference. https://www.mathw...

3 months ago | 0

How can I identify only the first or first two local minima from "islocalmin" and then display it in a table on a plot?

% Find the index of the first minimum TF=find(islocalmin(VarName2),1); % Get the values for the lower and upper curves lowerV...

3 months ago | 0

| accepted