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Vectorizing a loop that calculates cosd on every element?
You don't need vectorization to avoid computing the cosine on every iteration through the lambda loop - just put the calculation...

9 years 前 | 0

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what is the difference between imshow(im) or imshow(im, [])
If the second argument is not a spatial referencing object, a colormap or a string, it specifies the display range. From the <ht...

9 years 前 | 1

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I need help arranging two vectors
[AreaSorted, idx] = sort(Area); LengthSorted = Length(idx); WidthSorted = Width(idx);

9 years 前 | 2

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changing time from decimal days to +- 0 from high water
Guessing a bit, because you don't tell us what |pf| and |tf| are, but assuming they are water height and time vectors, I suspect...

9 years 前 | 0

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tell me about the methods to display an image and to display a part of image
See doc imshow You can select part of an image using indexing, or if you have the Image Processing Toolboox, with |imcro...

9 years 前 | 0

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Percentile of a value based on array of data
% Test data historicalData = rand(1000, 1); exogenousVariable = 0.7; % Compute centile nless = sum(historicalDat...

9 years 前 | 2

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What is the restriction of using FFT ?
The points made apply to Fourier analysis in general, not specifically to the FFT, and amount to asking whether the model you ar...

9 years 前 | 1

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Please help, logical indexing of 3D matrices
One way, slightly fiddly but the simplest I can think of now: [rowsB, colsB] = find(B); C = zeros(size(B)); ind3 = 1;...

9 years 前 | 0

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Using ifft to Recover Cosine from Two Delta Impulses
There are a number of reasons for the differences: * You do not need to divide by |No| after either the forward or backward t...

9 years 前 | 1

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How to interpret Binary '0' and '1' as Decimal 0 and 1?
One way: cdec = c - '0';

9 years 前 | 1

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How can I read global variables?
The problem is not connected with your use of a global variable. I think there are two possibilities: * If you click in the f...

9 years 前 | 0

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Finding when data in a matrix exceeds a certain value
find(X > 0, 1)

9 years 前 | 0

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How to create large (multiline) text file in matlab?
Yes, see doc fprintf or look <http://uk.mathworks.com/help/matlab/ref/fprintf.html here>. Multiple lines are achieved us...

9 years 前 | 0

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Error using * Inner matrix dimensions must agree.
It's likely that this line y = x1k * x2k; should be y = x1k .* x2k; The * operator does matrix multiplication, b...

9 years 前 | 0

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what is the size of the matrix of an image.will it is different for color images.
See the documentation for the Image Processing Toolbox, for example <http://uk.mathworks.com/help/images/image-types-in-the-tool...

9 years 前 | 0

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function kmeans is not able to process uint8 what should i do?
Convert your date to double before passing it to kmeans. For example, if Xi is your uint8 data array, Xd = double(Xi); i...

9 years 前 | 0

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"load_image" function help.
I do not know why the author chose this particular image for his examples, but there is a discussion of it <http://en.wikipedia....

9 years 前 | 0

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watershed segmentation
Good questions, but it's not clear what the link to MATLAB is. Anyway, you could do worse than start with <http://en.wikipedia.o...

9 years 前 | 1

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interpolation data and FFT resolution
The frequency resolution is always 1/T, where T is the time from the start to the end of the time series. The resolution is inde...

10 years 前 | 4

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Why must a function in the methods block of a class have an input argument?
The method declaration needs to start function stiffnessk(obj) The argument it needs is the object for which it is being...

10 years 前 | 3

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CONVERT DNA SEQUENCE INTO COMPLEX NUMBER
values('ATCG') = [-1+1i 1-1i -1-1i 1+1i]; % mapping from characters to complex s = 'ATCGCGCGATATATCGCGCG'; % any sp...

10 years 前 | 0

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conv2() for gray images
I'm not sure why you are converting i3 to uint8 before passing it to imshow. Try imshow(i3, []); which automatically sca...

10 years 前 | 0

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Detcting irregular circles with different sizes
You could consider the Hough Transform. The best place to start is <http://uk.mathworks.com/help/images/ref/imfindcircles.html i...

10 years 前 | 0

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mapping numbers to another number
I don't see why switching case might be relevant to this problem. Put the numbers you want to map to into an array outpu...

10 years 前 | 2

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Repeat previous row if condition
% Parameters cycleLength = 4; % number of rows in a cycle indexMult = 10; % multiplier for index within cycle ...

10 years 前 | 0

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fft - Documentation Question - What is "L"?
It's the number of data points in the synthesised signal vector. It didn't come from anywhere - the person writing the documenta...

10 years 前 | 0

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How to go to a main function from sub-function if sub-function is recursive? "return" does not work here
If the recursive function is structured properly, returning from the final call when the termination condition is satisfied will...

10 years 前 | 1

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Hough Transform - Finding the center of the hough transform circles
If it helps at all, <http://uk.mathworks.com/matlabcentral/fileexchange/26978-hough-transform-for-circles my version> of the FEX...

10 years 前 | 0

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Combining cells so items occur randomly or pseudorandomly within a new array
% test data expitemorder = { 'Strong_Alt_Prime2.png' 'Strong_Alt_Target2.png' 'Strong_Alt_Prime1.png' ...

10 years 前 | 0

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starting indexing of an array at values greater than 1
All MATLAB arrays are indexed from 1, but an alternative to Stephen Cobeldick's answer is to make an array Ashifted such that t...

10 years 前 | 0