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

4 years 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...

4 years ago | 0

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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...

4 years ago | 0

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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)

4 years 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...

4 years ago | 1

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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...

4 years ago | 0

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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...

4 years 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...

4 years 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...

4 years 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...

4 years ago | 0

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Answered
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);

4 years ago | 0

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Invalid use of -. At least one of the operands must be scalar or the operands must be the same size. The units of the operands must be commensurate.
Wherever you specify the units as 'C', put 'degC' instead

4 years ago | 0

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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 ...

4 years ago | 0

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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) ; ...

4 years ago | 0

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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 = ...

4 years ago | 0

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[DISCONTINUED] 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...

4 years ago | 4

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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...

4 years 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...

4 years ago | 0

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Answered
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...

4 years ago | 0

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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...

4 years 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 %...

4 years ago | 0

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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 ...

4 years 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) ...

4 years ago | 0

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

4 years ago | 0

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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...

4 years ago | 0

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

4 years ago | 0

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

4 years ago | 0

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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...

4 years ago | 0

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Move colorbar location to the east in tiled layout figure
does this work: cb = colorbar; cb.Layout.Tile = 'east'; (from the colorbar documentation)

4 years ago | 0

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Find indicies of k smallest matrix elements
[~,idx] = mink(A,2);

4 years ago | 0