Community Profile # Chris

Last seen: 3 dagar ago Active since 2018

doin' a PhD.
not good at interviews.
pessimist with a deep humanist streak.
never studied philosophy.

Programming Languages:
Python, C, MATLAB

#### Statistics

All
• • • • • • #### Content Feed

View by

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: ...

8 dagar ago | 2

| accepted

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...

11 dagar 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...

11 dagar ago | 0

| accepted

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

16 dagar 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...

17 dagar ago | 1

| accepted

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...

19 dagar ago | 1 answer | 1

### 1

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

19 dagar ago | 1

| accepted

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...

23 dagar 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...

26 dagar 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...

26 dagar ago | 0

| accepted

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))

26 dagar ago | 0

| accepted

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?

26 dagar ago | 0

| accepted

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; ...

26 dagar ago | 0

| accepted

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...

26 dagar 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...

26 dagar 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 = ...

26 dagar ago | 0

| accepted

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

26 dagar 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.

27 dagar 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',...

27 dagar 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...

27 dagar ago | 0

| accepted

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...

28 dagar 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...

28 dagar ago | 0

| accepted

How to remove outliers in a 3D surface
I would recommend trying the "clean outlier data" task in the live editor, after sorting the data: T = sortrows(T,1); % Sort by...

28 dagar ago | 0

Contour plot in 2D using x,y,z data

28 dagar ago | 0

how can i save the even index to a matrix 2:5 using for loop
z=randi([1 10],5,10) newmatrix = []; for i=1:5 if(mod(i,2)==0) for j=1:10 if(mod(j,2)==0) % ...

28 dagar ago | 1

How to make a contour plot with incomplete z data?
As far as I understand, you'll need a rectangular array representing the grid of intensity values. If your grid is square and yo...

29 dagar ago | 0

my while statement wont work
It looks like you need to reset Err to 1 after a loop completes.

30 dagar ago | 0

Question about finding the number of times an element appears in an array
A = randi(9,2) A(:) formats A in a column vector. A(:) A(:)==c compares the column to each element of c (possible because th...

ungefär en månad ago | 0

| accepted

Find the standard error of the mean for each column in a matrix containing NaN and numerical values
That's a 4x4 matrix, not 5x4. The default behavior or nanmean and nanstd is to give you the statistic for each column. Taking t...

ungefär en månad ago | 0

| accepted