# Questions tagged [derivative]

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I believe I am very close to the answer and only need a small nudge to get to the answer. What I want: I want to take a signal, use FFT to transform it to the frequency domain (FD), multiply it by $... 0answers 92 views ### Helmholtz decomposition implementation I need to perform the Helmholtz decomposition of a 2D flow. An old and obvious problem is the numerical differentiation (largely amplifying the noise). I do understand the procedure I am just ... 0answers 21 views ### derivative filter for computing speed from robot rangefinder I have a laser rangefinder on my robot and I need to compute the speed of the detected object. I have seen many different filters for that, but all of them apply only to offline data, or introduce ... 0answers 25 views ### What is the derivative of Radon Transformation? We have the Radon transformation, in the most common form:$g(\phi,r)=\int\int f(x,y)\delta(x\sin\phi-y\cos\phi-r)dxdy$Question 1: So what is the closed form of the derivative of Radon transform w.... 0answers 22 views ### Constructing a lowpass digital differentiator such that maximum error is$n$dB for passband I want to construct a lowpass digital differentiator with uniform-interval samples such that error from ideal differentiator is$n$dB in magnitude at maximum for the passband up to frequency$\...
In order to know if my signal is increasing or decreasing, I'm using the discrete derivative $y[n] = x[n] - x[n-1]$ or a smoothed version of it (for example Exponential Weight Moving Average of $y[n]$ ...
### How to find derivative of 2-D elliptical Gaussian function with different standard deviations along $x$ and $y$ directions?
I am trying to find the 2-D derivative of an elongated Gaussian density. The Gaussian has standard deviations $\sigma_x$ and $\sigma_y$. How can I get the scale-normalized 2-D Gaussian derivative in ...