Confused.Scientist's articles:

Items(17) /2 Next >> Last >|

Making discrete color table into a continuous one 3 56 (2/9/2010 1:46:38 PM) comp.lang.idl-pvwave I have the color table blues :( Does anyone have any tips on how to make a discrete set of 25 colors into a continuous 255 element color table? The discrete colors are: rgb = [[153,153,153], $ [21... Dave

symmetric toeplitz and circulant question 2 35 (6/10/2009 3:07:36 PM) comp.soft-sys.matlab Hi all, Does anyone know of a good reference describing the properties of symmetric Toeplitz matrices? I have a single example from a paper which describes that a symmetric Toeplitz matrix (m=5) is a b... Dave

SPIHT compression and noise 1 93 (4/30/2009 7:51:21 PM) comp.compression I have a rather basic question about SPIHT and other wavelet compression techniques... If I have an image with additive Gaussian noise that is uniformly distributed across the image, and I encode/ decode with S... Dave

Interpolation matrix 12 24 (3/3/2009 2:40:23 AM) comp.dsp I'm trying to define a couple of common signal interpolation/ resampling methods as a matrix operation, i.e. y = W z where, y is the interpolated data vector of dimension m x 1 W is the interpolation m... Dave

Quaternions 0 30 (4/4/2008 12:06:30 PM) comp.soft-sys.matlab Hi all, I am wondering if anyone knows of a way to smooth quaternion data? I have a long time series (1 Hz) of noisy (measured) quaternions that represents the attitude/orientation of a rigid body. I als... Dave

postgresql queries 6 34 (1/11/2008 3:55:34 PM) comp.lang.idl-pvwave Does anyone know if there is a general way to connect and query a postgresql database from within IDL using linux and os x? My group has a few linux licenses for 6.4/7.0 but I'm using an older version of the s... Dave

Cholesky inverse of a covariance matrix 9 163 (10/3/2007 1:06:05 AM) comp.lang.fortran Hi all, I'm struggling to compute the inverse of a covariance matrix using Cholesky decomposition. Using the code from Numerical Recipes (NR), I can compute the Cholesky decomposition, L, of matrix A such tha... Dave

Weighted least squares with minpack? 5 30 (9/19/2007 6:29:01 PM) comp.lang.fortran Hi all, I'm fumbling around trying to figure out how to use minpack (lmstr) for a weighted non-linear least squares fit and I know it shouldn't be as tough as I'm making it. For weights, I'm using a full cova... Confused

mpfit: multivariate fit 10 30 (5/8/2007 4:19:09 AM) comp.lang.idl-pvwave Hi all, I'm trying to use MPFIT to numerically estimate a coordinate transformation matrix that relates two sensors. One set is uncalibrated, and the other has a known calibration. So, I have a set of observ... Dave

Zero padding and the Shannon information content 10 22 (3/16/2007 4:06:03 AM) comp.dsp Hello all, I am confused about how zero-filling / windowing a signal alters its information content and I'm hoping someone here can help. I have a continuous signal (time domain) and I Fourier transform it to... Dave

Confused.Scientist's replies:

Items(9) /1

iTools: lines too thick to publish? 5 25 (11/7/2006 5:11:51 PM) comp.lang.idl-pvwave Hello, I've just received some feedback from a journal that the figures I created with iTools has lines that are simply too thick for publication. I saved the figure as a vector-based .eps file so this isn't ... Confused.Scientist (28)

Help with numerical integration 4 38 (12/4/2006 10:31:47 PM) comp.lang.idl-pvwave Hi all, I have never been particularly fond of numerical integration and generally do it pretty infrequently these days. Nevertheless, I am trying to do a 'quick-and-dirty' atmospheric refraction/ray-trace ca... Confused.Scientist (28)

Zero padding and the Shannon information content 10 22 (3/16/2007 4:06:03 AM) comp.dsp Hello all, I am confused about how zero-filling / windowing a signal alters its information content and I'm hoping someone here can help. I have a continuous signal (time domain) and I Fourier transform it to... Confused.Scientist (28)

mpfit: multivariate fit 10 30 (5/8/2007 4:19:09 AM) comp.lang.idl-pvwave Hi all, I'm trying to use MPFIT to numerically estimate a coordinate transformation matrix that relates two sensors. One set is uncalibrated, and the other has a known calibration. So, I have a set of observ... Confused.Scientist (28)

Weighted least squares with minpack? 5 30 (9/19/2007 6:29:01 PM) comp.lang.fortran Hi all, I'm fumbling around trying to figure out how to use minpack (lmstr) for a weighted non-linear least squares fit and I know it shouldn't be as tough as I'm making it. For weights, I'm using a full cova... Confused.Scientist (28)

Interpolation matrix 12 24 (3/3/2009 2:40:23 AM) comp.dsp I'm trying to define a couple of common signal interpolation/ resampling methods as a matrix operation, i.e. y = W z where, y is the interpolated data vector of dimension m x 1 W is the interpolation m... Confused.Scientist (28)

symmetric toeplitz and circulant question 2 35 (6/10/2009 3:07:36 PM) comp.soft-sys.matlab Hi all, Does anyone know of a good reference describing the properties of symmetric Toeplitz matrices? I have a single example from a paper which describes that a symmetric Toeplitz matrix (m=5) is a b... Confused.Scientist (28)

Extract / interpolate in 3d atmospheric field 2 169 (2/3/2010 1:57:44 PM) comp.lang.idl-pvwave I have some gridded, 3d atmospheric model data (pv, temperature, etc) and I am trying to pull some data out of the cube. IDL> help, data, /str ** Structure , 10 tags, length=701600, data length=701600, re... Dave

Making discrete color table into a continuous one 3 56 (2/9/2010 1:46:38 PM) comp.lang.idl-pvwave I have the color table blues :( Does anyone have any tips on how to make a discrete set of 25 colors into a continuous 255 element color table? The discrete colors are: rgb = [[153,153,153], $ [21... Confused.Scientist (28)