Anybody using Scilab?

Started by JBK in comp.dsp14 years ago 12 replies

Hello, I want to do IIR filtering in Scilab, but can't really figure out how it all works. The Matlab code for what I want to do would look...

Hello, I want to do IIR filtering in Scilab, but can't really figure out how it all works. The Matlab code for what I want to do would look something like this: x = some signal... B = [1 2 3]; A = [4 5 6]; y = filter(B,A,x); Now, that's quite simple, but how do I do the same thing in Scilab? It looks like I should be using flts(), but I can't really figure out how to translate my co...


Slightly OT: Scilab newbie documentation

Started by Rune Allnor in comp.dsp13 years ago 2 replies

Hi all. I?ve downloaded scilab 3.0 from www.scilab.org, and the thing appears to run fine on my PC. The documentations pops up for just...

Hi all. I?ve downloaded scilab 3.0 from www.scilab.org, and the thing appears to run fine on my PC. The documentations pops up for just about any conceivable finction. My problem is that I would like so see some "Getting Started" type of thing. Does anyone know where I can find such papers? Rune


Attempting DSP in Scilab -- filtering using convol()

Started by Richard Owlett in comp.dsp9 years ago 5 replies

I'm attempting to use convol() to implement a simple filter. Scilab's Help entry is terse to say the least. I suspect I should be using the...

I'm attempting to use convol() to implement a simple filter. Scilab's Help entry is terse to say the least. I suspect I should be using the overlap and add variant, but Scilab gives no example. I've experimented and wrote the following code. Calculating the convolution by both methods. The results can only be described as "similar". What am I missing? TIA t=[0:.00001:1]; s=si...


Help with Remez function in Scilab...

Started by ctulk in comp.dsp11 years ago 2 replies

Hello all...I'm new to the group and relatively new to Scilab. I'm trying to convert a section of code from Matlab to Scilab (please don't...

Hello all...I'm new to the group and relatively new to Scilab. I'm trying to convert a section of code from Matlab to Scilab (please don't ask "why?" as I'm still trying to figure that one out myself...suffice it to say it is "because I have to"), and I'm completely stuck on converting the following Matlab code: % y is a (1500,1) matrix of numbers (floats) x = remez(16,[0 .5],[0 pi/2],'d'); x...


Scilab group or similar

Started by Anonymous in comp.dsp10 years ago 5 replies

Hi everyone, im an undergrad at a brazilian university, im majoring in control engineering but im interested in signal processing, my question...

Hi everyone, im an undergrad at a brazilian university, im majoring in control engineering but im interested in signal processing, my question is: is there a discussion group, forum, or similar about Scilab? Ive noticed many of you discussing scilab issues, so I figured you'd know.. I find it very hard being the only student, non-matlab-ish... Thanks for the tip, regards, Donato Aze...


A 3D alternative to traditional spectrograms

Started by Richard Owlett in comp.dsp9 years ago

I've posted a Scilab program for creating a 3D alternative to traditional spectrograms on comp.soft-sys.math.scilab under subject line...

I've posted a Scilab program for creating a 3D alternative to traditional spectrograms on comp.soft-sys.math.scilab under subject line "Posting a program for critique". As Scilab can rotate 3D plots, looking from top down gives a traditional spectrogram.


how to generate periodic signals in scilab

Started by lakshminani in comp.dsp10 years ago 1 reply

Hi, i am lakshmi, I am working in scilab, I am unable to generate periodic signals in scilab. Any body please tell me how to generate the...

Hi, i am lakshmi, I am working in scilab, I am unable to generate periodic signals in scilab. Any body please tell me how to generate the periodic signals like (square, ramp signals )in scilab. with regards, Lakshmi.


Elderly newbie DSP questions

Started by Richard Owlett in comp.dsp14 years ago 10 replies

I've been asking some elementary questions. I've been accumulating links recommended to those asking "simple" questions. I've also noticed...

I've been asking some elementary questions. I've been accumulating links recommended to those asking "simple" questions. I've also noticed that having available something like Scilab is "educational". [ such not available in my era -- 60's ] Anyone know of sites that build on having such as Scilab available as an experiment[s/al] platform?


Octave or Scilab

Started by Ro_ny in comp.dsp4 years ago 28 replies

Hello people, For designing pulsed shaping and other filters on Windows 7 for Fixed-point MCUs, which is better to download (the latest...

Hello people, For designing pulsed shaping and other filters on Windows 7 for Fixed-point MCUs, which is better to download (the latest version of): Octave or Scilab? And both export to a file the coefficients normalized to the needed format e.g. Qm.n? PS: Octave is claimed to be much more compatible with Matlab. Rony J. _____________________________ Posted through www.DSPR...


Any DSPers using Scilab [ NEWBIE in trouble ; ]

Started by Richard Owlett in comp.dsp13 years ago 30 replies

Anyone have Scilab 2.7 or 3.0 up and running under WinXP? I'm trying to plot magnitude of FFT of rectangular pulse/window. My code...

Anyone have Scilab 2.7 or 3.0 up and running under WinXP? I'm trying to plot magnitude of FFT of rectangular pulse/window. My code is a(1:899)=1; a(900:1000)=0; plot2d( [1:1000], abs(fft(a,-1)), logflag="nl") My output does not resemble what Mr. Lyons gives in Figure 3-25c. Multiple sources agree with Rick ,)


Is there a scilab forum on the internet?

Started by maxplanck in comp.dsp10 years ago 1 reply

Is there a scilab forum on the internet? If so, what's the web address? Thanks a lot

Is there a scilab forum on the internet? If so, what's the web address? Thanks a lot


Scilab and DSP

Started by Andreas Vaerge in comp.dsp10 years ago 13 replies

In an attempt to study DSP (interest not immidiate use) I have bought "Digital Signal Processing 3rd edition" by Proakis and Manolakis and the...

In an attempt to study DSP (interest not immidiate use) I have bought "Digital Signal Processing 3rd edition" by Proakis and Manolakis and the self study guide also by Proakis. However it is assumed that I have MatLab available which I cannot quite afford :-(. I have found SciLab which (according to info on the net) should be able of doing most of what MatLab can, just differently. Now, I su...


Scilab, sparse matricies, and polyphase filtering

Started by Tim Wescott in comp.dsp9 years ago 6 replies

The subject line says it all. I need to resample some data in Scilab -- I'm getting data sampled at 5MHz that I need to resample to 4.9...

The subject line says it all. I need to resample some data in Scilab -- I'm getting data sampled at 5MHz that I need to resample to 4.9 some-odd MHz. When I was using 20ms long data sets it worked very well to do an FFT, trim bins out of the middle to reduce the frequency by the right factor, then do an IFFT. Now we're doing the "real" algorithm with 1/2 second long data sets, and i...


Scilab's 'optim' and 'splin'

Started by Tim Wescott in comp.dsp11 years ago 6 replies

I've got this really cool application that makes a smoothed line using splines, then fits it to a source line using a nonlinear weighting. I'm...

I've got this really cool application that makes a smoothed line using splines, then fits it to a source line using a nonlinear weighting. I'm currently using SciLab with it's 'optim' and 'splin' function to do this, but now I need to write some embeddable C++ code. The 'splin' function is obvious -- it generates a spline from a number of inflection points. The 'optim' function as I a...


What is it I don't undersatand about FFT (&/or SCILAB)?

Started by Richard Owlett in comp.dsp11 years ago 8 replies

I'm interested in the general issue of how the spectrum of a signal changes over time. In thread titled "FFT not showing high frequency...

I'm interested in the general issue of how the spectrum of a signal changes over time. In thread titled "FFT not showing high frequency oscillation", provided data that made a nice clean test case. I posed myself a "simple" question, "Is the parasitic oscillation changing over time?" I imported his data into Excel for some experimentation. Then decided to use SCILAB whose facilities a...


y=filter(A,B,x) how?

Started by Helmut Sennewald in comp.dsp12 years ago 3 replies

Hello, I want to do digital filtering of an digitized signal. The Matlab-function y=filter(A, B, x) would do exactly what I need....

Hello, I want to do digital filtering of an digitized signal. The Matlab-function y=filter(A, B, x) would do exactly what I need. A(denominator) and B(numerator) contain the coefficients of the digital filter H(z). I couldn't find any equivalent function in Scilab. What function in Scilab is quivalent to this filter()-function from Matlab? Best regards, Helmut


scilab help

Started by bharat pathak in comp.dsp9 years ago

hello, does anyone know how to lock the zoom button in scilab. for example: x = rand(1,100); plot(x) I want to zoom...

hello, does anyone know how to lock the zoom button in scilab. for example: x = rand(1,100); plot(x) I want to zoom again and again in various parts of the plot without clicking always the radio button called "zoom" on the top left of the plot. The radio button in active only for one zoom. unlike octave in which i could continously zoom to any area usi...


Scilab bilinear transform

Started by Andrew Holme in comp.dsp10 years ago 5 replies

I'm using Scilab to convert an s-domain filter design to the z-domain for a PLL simulation. It works fine with a time-step of one micro-second...

I'm using Scilab to convert an s-domain filter design to the z-domain for a PLL simulation. It works fine with a time-step of one micro-second (Ts=1e-6): the denominator contains z^4 terms, which I was expecting; and the PLL simulation agrees with the real hardware; but I only get z^3 terms if I reduce the time-step to 1e-7; and the simulation is unstable (it oscillates at 3 KHz). What...


Python question

Started by Tim Wescott in comp.dsp2 years ago 28 replies

Apropos to the question "Python for DSP" in comp.dsp (http:// www.dsprelated.com/showthread/comp.dsp/243722-1.php): How fully object-oriented...

Apropos to the question "Python for DSP" in comp.dsp (http:// www.dsprelated.com/showthread/comp.dsp/243722-1.php): How fully object-oriented is Python? I'm doing an app that really wants to be prototyped in something Scilab-ish (i.e., interpreted so it's easy to do graphs or computation on bits of it), but which is seriously challenging Scilab's sorta-object oriented-ness. I'm running...


Scilab Inverse FFT

Started by Richard Owlett in comp.dsp14 years ago 9 replies

How do I perform an inverse FFT in Scilab?

How do I perform an inverse FFT in Scilab?