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Use two bsxfun for row and column vector to span matrix without putting in memory
Hello, I have a vector A of size 1xN and a vector B of size MxN I can span a MxN matrix temp with temp=bsxfun(@times,A,B);. ...

etwa 7 Jahre vor | 1 Antwort | 0

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Efficiently calculate distance between moving point and fixed points
Hello, I have a grid of point coordinates xval=0:1:5000; yval=0:1:2000; zval=1; [X,Y,Z]=meshgrid(xval,yval,zv...

etwa 7 Jahre vor | 1 Antwort | 0

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Better interpolation of nonuniform data to uniform grid than with spline
I am resampling non-uniformly sampled data to a uniform grid with a spline interpolation. However, if the signal is of high fre...

etwa 7 Jahre vor | 0 Antworten | 0

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Speed up 1D spline interpolation on matrix
Hello, I have a NxM matrix named data and I need to spline interpolate each row of my matrix according to: for k=1:size(...

etwa 7 Jahre vor | 1 Antwort | 0

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ned2ecef without toolbox
Are there any user-made functions available somewhere that achieve the same? The lg2ct function in the Geodetic Toolbox on the ...

mehr als 7 Jahre vor | 0 Antworten | 0

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Multiply each column in MxN matrix with it's transpose to create MxMxN matrix
Hello, I have a MxN matrix, and I need to multiply each column vector that is of size Mx1 with it's transpose. This gives me...

mehr als 7 Jahre vor | 2 Antworten | 0

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Interpolate uniform to non-uniform sampling, artifacts with spline
Hi, I have to resample uniformly sampled data to a non-uniform sampling. I use the spline function for this, and if the sample...

mehr als 7 Jahre vor | 0 Antworten | 0

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Merge multiple GPS and IMU to get more accurate position and attitude
I have multiple GPS and IMU that are located at known positions of an aircraft. Is there a ready to use implementation to merge...

mehr als 7 Jahre vor | 0 Antworten | 0

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Best way to smooth GPS data
Hi, I have a GPS signal sampled at 1Hz. It is too noisy, so I want to smooth the signal. I tried using a moving average, but i...

mehr als 7 Jahre vor | 3 Antworten | 0

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reshape, remove 16 elements, keep 1000*8, remove ..
Can I solve this without a loop?/What is the fastest way? I have a long vector consisting of [16Elements 1000*8Elements 16Eleme...

mehr als 7 Jahre vor | 1 Antwort | 0

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Calculate only fraction of spectrum with FFT
I have a signal with 4096 samples. I can calculate the frequency spectrum of this signal with fft. But I am only interested in...

mehr als 7 Jahre vor | 1 Antwort | 0

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Speed up this fread loop
I need your help! I am going to read a lot of big files with fread. Any ideas on how to speed this up? Also if there is a way ...

mehr als 7 Jahre vor | 2 Antworten | 0

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Matrix indexing: fast way to compute covariance of N different MxL matrices that are saved in NxMxL matrix
I have a NxMxL matrix called bigmatrix That I can split into N temporary submatrices. On each temporary submatrix I need to ca...

mehr als 7 Jahre vor | 1 Antwort | 0

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IFFT calculate only one timesample
I have a frequency signal and I apply an IFFT to it. This results in the time domain x(n) which has N samples. But I am really...

mehr als 7 Jahre vor | 1 Antwort | 0

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Combine multiplication filter in time and frequency domain
Hello, I perform a FFT on my signal x, which yields X. Then I perform a multiplication in the frequency with my filter W, whic...

mehr als 7 Jahre vor | 1 Antwort | 0

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bsxfun to multiply matrix with vector multiple times in for loop --> how faster?
I have a 2D matrix of size NxN, and each row I am multiplying with a 1xN vector with bsxfun in a for loop like this: for k=...

mehr als 7 Jahre vor | 2 Antworten | 0

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How to vectorize loop with linspace for performance
Besides prelocation my matrix A, how can I save time here? for k=1:1:10000 A(k,:)=firstValue(k):fixedStep:lastValue(k); ...

fast 9 Jahre vor | 1 Antwort | 0

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Fast Look-up table
Good morning, I have a long array signal with values x. Now for each of those values x I want to find the closest fit in anoth...

fast 10 Jahre vor | 1 Antwort | 0

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Highly interpolate complex spectrum
Good afternoon, I have a complex spectrum of a signal that is centered around a center frequency with a certain bandwidth. I...

fast 10 Jahre vor | 0 Antworten | 0

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Highly oversample FFT2 in one direction for peak detection
Hello, I have a 2D image and the resulting FFT2 has high peak. Now I can find the maximum to get the resulting peak shift in e...

fast 10 Jahre vor | 0 Antworten | 0

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Translate position uncertainty of two objects to uncertainty of distance between them
Hello, I have a plane and in this plane there are two objects. The real location of each object is somewhere in the circle o...

etwa 10 Jahre vor | 0 Antworten | 0

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Probability of two adjacent cells being below gaussian percentile
Hello, I have a matrix, whose data is described by a gaussian curve. Now I have a probability of 8%, that the data falls below...

mehr als 10 Jahre vor | 1 Antwort | 0

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Precision when dividing two functions going against zero
Hi, I have two functions A=sinc(c1*x)-cos(c2*x) whichs is Zero for x=0. Now I want to calculate A/(c3*x). The expected result...

mehr als 10 Jahre vor | 2 Antworten | 0

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Image from Gradient and Magnitude
Hello, with imgradient I can compute the magnitude and direction of an image's gradient. Is it also possible to somehow comput...

mehr als 10 Jahre vor | 1 Antwort | 0

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Height difference between earth models
Hello, is it possible to calculate the height difference between earth models at specific points of lat and long? For example ...

mehr als 10 Jahre vor | 0 Antworten | 0

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rectangularPulse: no drop to 1/2 at edges
Hello I want to do the fourier of a rectangular pulse which is also 1 at the edges, so that the fourier returns a sinc function...

mehr als 10 Jahre vor | 2 Antworten | 1

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