plotting a function correctly
x=[-2:0.1:2]; y = exp(-x)-x; plot(x,y)

11 months ago | 0

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what is the code for bin histogram of fraction to the bin
You can specify the histogram edges like this, with the height of the bars normalized to %: x = randn(1000,1); edges = 25:5:50...

11 months ago | 0

Plotting Phase angle in Matlab
First off, "load" is for Matlab files, not raw text. Check out textscan. If your code isn't error-ing, you probably have old ver...

11 months ago | 0

Change histogram to more bars
histogram accepts the number of bins as a second argument: x = randn(1000,1); nbins = 25; h = histogram(x,nbins)

11 months ago | 1

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What is this code doing?
Short version: copy a list of Matlab script/function files from wherever Matlab finds them into a particular directory ('C:\TEMP...

11 months ago | 0

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Extracting data from an array
To extract the first three rows: B3 = B(1:3,:); x = B3(1,:); y = B3(2,:); z = B3(3,:); But, if B is really 4x1, then you on...

11 months ago | 0

can anyone find the error?
Perhaps you are calling the function with two few arguments, such as this on the command line: quadraticc(2) If you are simply...

11 months ago | 0

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Sort and extract elemets from a structure.
tables are a vastly superior way of handling this data. Does this do it? mydata= readtable('mytext.txt'); sorted_data = sortro...

11 months ago | 0

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How to extract values from each structure in the .mat file
keeps the names, but as fieldnames in a new struct, signals, rather than variables (see Walter's comment): data = load('data.ma...

11 months ago | 1

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Changing the size of an array in a while loop
keeps the vector the same length A_i = gradient(A_0,dt).*I.^2; changes size of vector (and uses a for loop since there are a...

11 months ago | 0

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I have the following Matlab code that produces a x2 zoomed image of the input using Pixel Replication. How can I change it to shrink an image?
throw out every other row and column: img1 = imread(filename); N = img1(2:2:end,2:2:end);

11 months ago | 0

Copy files from a folder to another directory
check out dir and copyfile. My suggestion would be to create the lists of file and folders first, check them, then do something ...

11 months ago | 0

How can i create a vector having 6 values between two numbers
Assuming you want them evenly spaced: x = linspace(2,12,6); If you want them randomly spaced x = [2 ; 2+(12-2)*rand(4,1) ; ...

11 months ago | 0

How to combine indexing?
There may be a better way, but this should work: % set up a logical-indexing vector that selects no elements idx_Ev_not_Art = ...

11 months ago | 0

MATLAB Answers Wish-list #5 (and bug reports)
Being able to collapse items in the activity feed would be useful. Fairly regularly, I have 3-7 items for "X commented and edite...

11 months ago | 4

Compacting a For Loop
norm_er = 1.301; exp_er = 9.126; log_er = 1.301; ray_er = 2.606; Errors = [norm_er,exp_er,log_er,ray_er]; % set a tolerance...

12 months ago | 0

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Wondering about the efficiency of my code or if there is a better way to do what I am trying to do?
generally, deleting columns (esp. one-by-one) is less efficient than indexing. Assuming all of the tests have passed, you can si...

12 months ago | 0

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Looking for the RGB values of the 8-bit 256 colours?
finish reading the posted info: "An 8-bit display can produce any of the [2^24] colors available on a 24-bit display, but only 2...

12 months ago | 0

Which function should I use for generating the weighted least squares fit linear line for a given data?
fitlm accepts weights as a vector, but doesn't come with any pre-designed ones mdl = fitlm(x,y,'Weights',weight); Ypred = pred...

12 months ago | 0

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fprintf table not aligned
generally, I suggest not using tabs when you want a table aligned. Instead, set the field widths larger: fprintf('%6.2f %9.3f %...

12 months ago | 0

How do separate plot into months?
probably easiest would be to create a datetime object: % sample data data = rand(1,8760); % starting year/month/day of data ...

12 months ago | 0

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Fit a curve to a nonlinear 1D data
x=1:12; y=[18.92, 21.6, 27.4, 43.07, 85.66, 230.12, 347.02, 289.74, 197.32, 95.32, 39.5, 19]; % fit to a quadratic (degree 2) ...

12 months ago | 0

"Plot" image with size, position and rotation
see this question: Plot a figure in which there is an image that moves and rotates

12 months ago | 0

Loop to separate rows in one matrix and delete elements in that matrix based on another matrix
% find indices where z_probs<0.5 idx = (z_probs(:,:,1)<0.5); % "remove" those values in b_loc by setting them to NaN b_loc(id...

12 months ago | 0

need help for transfer Whlile loop from For loop
First issue: for loop ends when error<tol while loop continues when error<tol

12 months ago | 0

Plotting part of an array
simplest: xlim([0 0.2])

12 months ago | 0

Rotate Spherical Coordinates to find new Vector Magnitude
It sounds like the goal is to find the projection of the vector along the direction defined by theta=100, phi=150. If this is th...

12 months ago | 0

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