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Colormap always shades of blue
You're not specifying your colormap length. If you don't do that, colormap() will create a map equal to the length of the curre...

4 years ago | 0

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Answered
what does format short in a matlab code do??
It just changes the display format used when numbers are printed to console. format long pi format short pi There are othe...

4 years ago | 0

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Answered
trying to store figures in an array, in a loop, instead of printing each figure
Since you're just using the gray colormap, there really isn't much that needs to be done. You can use mat2gray() to normalize t...

4 years ago | 2

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while loop not working
This isn't exactly an elegant solution, but if we're gathering a bunch of parameters using input(), I think we've already crosse...

4 years ago | 0

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Select only determined rows in a matrix
Something like this. You'll have to adjust the starting index as needed: A = repmat((1:100).',[1 4]) % smaller example (100x4)...

4 years ago | 0

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Is it possible to use the colormap "Purples" in MATLAB, which maps zeros to white?
The answer is yes, but that's not really helpful. The real question is how do you get the colormap from matplotlib into MATLAB?...

4 years ago | 0

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How to plot a matrix in a checkerboard style
Something like this should be a start: Im = [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 1 0 0 ...

4 years ago | 2

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Answered
How do you write this "| "symbol in MATLAB?
The expression ((floor(mr/2)==ceil(mr/2)) | (floor(mc/2)==ceil(mc/2))) conceptually says ((number of rows is even) OR (number...

4 years ago | 0

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Answered
only masking part of image help
There's at least one thing going on here. This operation frame(755:933,206:388)<threshold will return a 179x183 logical image...

4 years ago | 1

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Answered
How to plot a different symbol and symbol line for each plot inside this loop?
I'm not sure why you're using a loop to create the same plots three times with different symbols. Are there other columns (of a...

4 years ago | 0

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Answered
how to change colors of lines in a plot to exist on a scale
What exactly do you mean by "on a scale"? If what you're looking for is a means to have the line colors share a continuous colo...

4 years ago | 0

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Create rapid beeping tone in matlab
Depends how you want to do it. I bet there's lots of ways. I just made a piecewise signal and played it. fs = 8192; toned...

4 years ago | 0

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Undefined components in YCbCr color space
I know this is dead, but I'm bored on a slow Saturday. No, not in the same way. YCbCr is just a simple linear transformation o...

4 years ago | 0

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Answered
How to find a value in a matrix
Consider the simple example: % two orthogonal grids [x y] = meshgrid(linspace(0,1,10)) % the point you're trying to locate t...

4 years ago | 0

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Answered
Integration with arbitrary constant
It depends if you want to do this numerically or symbolically % symbolically syms x a f = x-a; int(f,0,1) % answer is a func...

4 years ago | 0

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loop over all values in V
If this is the expression you're using % f is of the form A/I2 f = @(I2,V) (I_p - I_o*(exp((V+R_s*I2)./V_t)-1) - V + R_s*I2/R_...

4 years ago | 0

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multiscale retinex
This FEX submission is probably of interest: https://www.mathworks.com/matlabcentral/fileexchange/71386-multiscale-retinex Thi...

4 years ago | 0

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Convert RGB to HSI
Yes, it makes a difference. Compare the results for HSI, HSL and HSV: R = [ 120 20 30; 170 20 70; 120 140 70 ]; G =...

4 years ago | 0

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Answered
Save mean values in additional column
Something like this % dummy data N = 15; Range1peaks = [10*rand(N,1)-70 2*rand(N,1)+4 randi([0 5],N,1)] % sort [~,Peaks_ind...

4 years ago | 0

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Answered
Images stored in a cell array are getting cut off
Whatever your processImage function is returning, it's not 1024x1344 raster data. I doubt it's getting cut off either. It's a ...

4 years ago | 0

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How to split a vector into 2 vectors, that one holds the evens and one hold the odds
Something like this will extract the contents of odd/even indices: V = 1:10; odds = V(1:2:end) evens = V(2:2:end) Note that'...

4 years ago | 1

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Answered
How can I use the solve command in Matlab to find the intersection of two equations?
Something like this: % solve system of equations syms x y eqn1 = x^2 + y^2 == 9; eqn2 = 2*x + 3*y == 4; S = solve([eqn2 e...

4 years ago | 0

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How to select several intervals from a vector?
Idk. Here's three ways. They all use loops. Is there something more elegant? Prrrrobably. Is it faster? Probably depends. ...

4 years ago | 0

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when making array of several sound signals, it doesn't give correct sounds when indexing each element
Something like this keys = '8675309'; toneduration = 0.4; spaceduration = 0.1; fs = 8000; sourcetones = [697 770 852 941...

4 years ago | 0

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Answered
Remove the repetitive items in matrix
You're using solve to solve two independent equations as if they were a system, and solve is accordingly returning a set of poin...

4 years ago | 0

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Answered
top- hat transform for signal processing
The tophat and bottomhat operations are the difference of the source image and the opening/closing of said image with the select...

4 years ago | 0

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Please let me know a way to use for loop to extract the first row elements from each column of data and check a condition and store these in a matrix
Something like this C = {'f' 'm' 'f' 'female' 'male'; '5.9' '6' '172' '' '180' }; g =...

4 years ago | 0

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I need some help with a mathlab project
Use a while loop. Switch-case is more concise. x = 0; while true fprintf('x is currently %d \n',x) uresp = input('...

4 years ago | 0

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sorting a cell array
Something like this: C = {3,1,6,[2,6,7],[4,10],10}; % don't call it 'cell' [~,idx] = sort(cellfun(@(x) x(1),C),'ascend'); C =...

4 years ago | 0

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Answered
Setting the color of specific cells in a heatmap that contains two types of data
You can use NaN to indicate out-of-range data h = rand(10,10); h(h<0.1) = NaN; hh = heatmap(h); hh.MissingDataLabel = 'h <...

4 years ago | 0

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