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D_coder


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36 total contributions since 2018

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Question


cputime() related question
Just a quick question is there a difference between t1 = cputitme(); t2 = cputime(); t = t2 - t1 and t1 = cputtime(); t...

2 maanden ago | 0 answers | 0

0

answers

Question


Perform processing over each row of table starting from first non-zero element in that row
Hello is there a way to perform mean and movmean of each row of the table starting from its first non zero element?

3 maanden ago | 1 answer | 0

1

answer

Question


How do we do operations directly on table elements in matlab?
I am thinking of doing min max normalization of my data where if x is vector the procedure is as follows x = (x- min(x))/(max(x)...

3 maanden ago | 2 answers | 0

2

answers

Question


How do we rotate two different image objects at the same time in a plot
so lets say I have a 3D surf plot with three different surface objects s1, s2, s3 is it possible to use rotate function to rota...

4 maanden ago | 1 answer | 0

1

answer

Question


Why hough transform is detecting only 1 horizontal line in the image ?
Here is my code: sx_norm = sx/max(sx(:)); sx_norm = movmean(sx_norm,5,2); %remove discontinuities by moving average N = size(...

6 maanden ago | 1 answer | 0

1

answer

Question


How do I apply a window on an image to keep the part in the window while reduce the resolution (clarity) of the remaining part of the picture?
Suppose I have an image with three circles and a line as shown below. I want to apply a trapezoidal type window (see dotted line...

6 maanden ago | 1 answer | 0

1

answer

Question


Simplifying complex multiplications by means of polar coordinates
I have a complex matrix A of size and another complex matrix P that has same size as A. But abs(P) = ones(size(M,N)) which ind...

7 maanden ago | 1 answer | 0

1

answer

Question


parallel execution of loop
I have the following structure for i = 1:N %some lines of code for j = 1:M %some line...

meer dan een jaar ago | 0 answers | 0

0

answers

Question


How to add two images excluding simalar elements
The figure below shows two images and their addition. Is there a simple code or a function to avoid adding the highlighted area ...

meer dan een jaar ago | 1 answer | 0

1

answer

Question


Find the interval of an envelope corresponding to a specific peak after peak detection
I have done the peak detection to find the highest peak in the image below. How do I find the interval of the envelope correspon...

meer dan een jaar ago | 1 answer | 0

1

answer

Question


find peaks in a mesh plot
How do I find peaks in a mesh plot and also find its location on the mesh grid?

meer dan een jaar ago | 2 answers | 0

2

answers

Question


Thresholding based on energy
I have an image which is very sparse. I want to threshold the image by retaining a certain amount of energy. What is the most ef...

meer dan een jaar ago | 1 answer | 0

1

answer

Question


Is it possible to perform multiplication and update 'val' inside accumarray?
An accumarray function is defined as A = accumarray(subs,val,sz) I am running accumarray function in a loop , Is it po...

ongeveer 2 jaar ago | 0 answers | 0

0

answers

Question


Is there a function that performs element by element multiplication between two variables and stores in one of the variable by default?
I want to do this operation A = A.*B; Is there a function func(A, B) that multiplies A and B and saves the res...

ongeveer 2 jaar ago | 2 answers | 0

2

answers

Question


Summing of non-zero elements of columns using indexing
I have idx, is there a way of using idx to make the sum(matrix,1) in the below code cheaper. In another words, is it possible to...

ongeveer 2 jaar ago | 2 answers | 0

2

answers

Answered
HI friends, I need a matlab code of economic load dispatch with loss.
Here is one code which I found https://www.mathworks.com/matlabcentral/fileexchange/49456-economic-dispatch-including-losses He...

ongeveer 2 jaar ago | 0

Question


is there any faster way to operate a group of statements in a loop only once, than applying if else
for ......... statemets 1; statements 2: if iteration == 0 [value1,value2] = function(args1,args2); %dependent on ...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Answered
How can I make derivatives with several variables?
You can try this a = a1^2*a2^2; diff(a,a1) + diff(a,a2); ans = 2*a1^2*a2 + 2*a1*a2^2

ongeveer 2 jaar ago | 1

Question


Sparse for element by element operation
If we want to perform the product of two sparse matrices or sparse and a full matrix , sparse function is very useful as it avoi...

ongeveer 2 jaar ago | 2 answers | 0

2

answers

Question


Sparse and binary mask
I am working on saving computations and speeding up my Matlab code. Here's what I do Perform thresholding on an image and mak...

ongeveer 2 jaar ago | 3 answers | 0

3

answers

Question


saving multiplications with zeros in a loop
%if true for i iterations Matrix = Matrix.*phase %Matrix has lot of zeros I want to skip multiplications with zero. Is it po...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


convert whole code to double
is it possible by anyway to convert whole code to double in a single step? For operations such as sparse single format and integ...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


Calculate values only once in the loop
Suppose I have a code running in a loop I have done some operations and I create a matrix in the loop, that matrix has the sam...

ongeveer 2 jaar ago | 2 answers | 0

2

answers

Question


can anyone tell me an intuitive way of finding number of bins for histcounts function
The binning algorithm used by matlab is very expensive [N,edges] = histcounts(I) Instead I am looking for some different and co...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


why does method 1 result not equal to method 2 result even if both perform the same thing ?
a = [2 5 2 9 ; 3 2 5 0; 4 5 9 2; 1 6 1 5] threshold = 3 %function 1 z = 0; for n = 1: size(a,1) for m = 1...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


How do I threshold the image automatically based on its energy content?
Say my threshold is taking in those components that constitute about 75% of energy of image and making the remaining as zero.How...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


Histogram based thresholding for reduction in computation
i am planning to use histcounts () function for histogram based threshold We know that histogram is a plot of pixel intensity v...

ongeveer 2 jaar ago | 2 answers | 0

2

answers

Question


Getting values of the histogram without actually plotting it
<</matlabcentral/answers/uploaded_files/130633/Screenshot%20(259).png>> Hello, I am working on automatically adjusting the th...

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


Difference between graythresh and multithresh for one value of threshold.
graythresh(I) and multithresh(I,1) gives me different values even if both are based on otsu's method of thresholding Why?

ongeveer 2 jaar ago | 1 answer | 0

1

answer

Question


For a loop , to carry out element by element multiplication is bsxfun better than conventional element by element.
for number of iterations A = A.*B; %A and B both are complex end Will the loop be faster if I replace A.*B wit...

ongeveer 2 jaar ago | 3 answers | 1

3

answers

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