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Question

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);. ...

6 years ago | 1 answer | 0

### 1

answerQuestion

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...

6 years ago | 1 answer | 0

### 1

answerQuestion

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...

6 years ago | 0 answers | 0

### 0

answersQuestion

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(...

7 years ago | 1 answer | 0

### 1

answerQuestion

ned2ecef without toolbox

Are there any user-made functions available somewhere that achieve the same? The lg2ct function in the Geodetic Toolbox on the ...

7 years ago | 0 answers | 0

### 0

answersQuestion

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...

7 years ago | 2 answers | 0

### 2

answersQuestion

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...

7 years ago | 0 answers | 0

### 0

answersQuestion

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...

7 years ago | 0 answers | 0

### 0

answersQuestion

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...

7 years ago | 3 answers | 0

### 3

answersQuestion

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...

7 years ago | 1 answer | 0

### 1

answerQuestion

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...

7 years ago | 1 answer | 0

### 1

answerQuestion

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 ...

7 years ago | 2 answers | 0

### 2

answersQuestion

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...

7 years ago | 1 answer | 0

### 1

answerQuestion

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...

7 years ago | 1 answer | 0

### 1

answerQuestion

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...

7 years ago | 1 answer | 0

### 1

answerQuestion

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=...

7 years ago | 2 answers | 0

### 2

answersQuestion

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); ...

8 years ago | 1 answer | 0

### 1

answerQuestion

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...

9 years ago | 1 answer | 0

### 1

answerQuestion

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...

9 years ago | 0 answers | 0

### 0

answersQuestion

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...

9 years ago | 0 answers | 0

### 0

answersQuestion

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...

9 years ago | 0 answers | 0

### 0

answersQuestion

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...

10 years ago | 1 answer | 0

### 1

answerQuestion

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...

10 years ago | 2 answers | 0

### 2

answersQuestion

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...

10 years ago | 1 answer | 0

### 1

answerQuestion

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 ...

10 years ago | 0 answers | 0

### 0

answersQuestion

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...

10 years ago | 2 answers | 1