allnor's articles:

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Internet access during exams 45 53 (1/5/2012 10:40:48 PM) comp.soft-sys.matlab Just a heads-up / warning for the regulars who answer questions and provide other help here: The Norwegian Ministry of Education is abut to test examinations where students have access to internet: http://www... Rune

OT: What does 'rocket' mean? 37 56 (12/10/2011 3:22:16 PM) comp.dsp Hi all. These days the word 'rocket' is used to denote a flying missile, propelled by the rapid intrenal burning of some fuel, where the expelled exhaust gases provide the driving force. Some 200 years ago, S... Rune

Default template function objects 0 72 (12/3/2011 5:22:21 PM) comp.lang.c++ Hi all. I am trying to implement a class for numerical work. Prt of the functionality will be an accumulator, that is, a scalar variable x that scales general data y on the form (declarations below) T x; U y;... Rune

Lingo for layfolk? 30 72 (9/2/2011 10:49:48 PM) comp.dsp Hi all, I am preparing a course for math layfolk, but need to communicate the concepts of 'continuous' and 'discrete' variables. Users of a software package will need to use these concepts in order to select t... Rune

Puzzle: How to extract desired info from data? 24 47 (6/22/2011 8:28:58 AM) comp.dsp For those who have too much time on their hands - consider a set-up like this (view with fixed-width font): Thermostate Dim Reservoir switch ... Rune

Morphological time series processing? 2 46 (6/16/2011 2:42:01 AM) comp.soft-sys.matlab Hi all. I have a set of noisy time series data that I have 'distilled' as follows: 1) Noise reduction 2) Differentiate the result from 1) 3) Take the sign of the result from 2) 4) Compute the cumulative sum o... Rune

Boost.bind and performance penalties? 7 49 (5/25/2011 11:56:50 AM) comp.lang.c++ Hi all. I have this application which is heavy on computations on data scattered in RAM. The task is to generate a triangulated surface from a set of scattered (x,y,z) data. In this application the memory mana... Rune

Tune PID controller? 19 47 (5/11/2011 9:16:05 AM) comp.dsp Hi all. I need to tune a PID controller with time constants (period of the scillation) on the order of hours. Any suggestion for procedures or algorithms? Literature? Rune ... Rune

Unstable DATETICK 10 54 (4/26/2011 3:45:57 AM) comp.soft-sys.matlab Hi all. I have this annoying problem with DATETICK (R2010a): I have a script that does a query towards a database and extracts some data. The data are then processed in a number of ways, and plotted in one fig... Rune

OT: Meaningless labour as penalty? 8 55 (4/13/2011 10:28:19 AM) comp.dsp Hi all. I have this vague recollection of having heard about some correction facility or prison, where the inmates were punished by having to shuffle a pile of dirt from one side of a 0.5 m wall to the other. ... Rune

allnor's replies:

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arithmetics in matlab 7 60 (1/8/2012 11:26:08 PM) comp.soft-sys.matlab Hi, when Matlab performs 1/(4.1-4), the result in double precision is 10.000000000000036 I am not quite sure why there is a 36 at the very end? Thank you ... plutonesque (390)

How to represent a 4D matrix being the forth dimension the color? 4 59 (1/9/2012 11:54:08 AM) comp.soft-sys.matlab Hi, I have a 4D matrix, size 256 256 120 3, being 120 images of 256x256 pixels, and the 3 is for RGB colors. Please, how could I visualize the matrix in 3D with the correspondent colors? Thanks very much ... javsanzperez (59)

cov function gives wrong covariance matrix 2 66 (1/9/2012 12:09:09 PM) comp.soft-sys.matlab When trying to reconstruct the covariance matrix from data, I'm getting a wrong estimate using the cov function. Should I report this as a major bug? How can I get the right covariance matrix? The example belo... martaskolda (1)

questions on constellation diagram 12 67 (1/9/2012 6:10:35 PM) comp.dsp Hi, All Experts, Thanks for answering my question in last post (especially Eric Jacobsen Sir), I have few questions on constellation diagram. Please let know the the article/paper to understand below points... aizzaahmed (35)

Strategy for interfacing c-mex s-function with external model 5 45 (1/9/2012 8:34:08 PM) comp.soft-sys.matlab I have a c-mex s-function block that is called from my Simulink model. This Simulink model also contains a block that contains a biomechanical model (it receives muscle activations as inputs, and outputs joint ... kmj.work (159)

Getting a curve smoother 3 56 (1/9/2012 11:42:09 PM) comp.soft-sys.matlab Hi, I am working on finite differences applied to heat equation. I impose the temperature at the boundaries of the part, but the cycle of temperature I am imposing is too sharp. I would like to get it smoother... maxroucool (6)

compute dtft using trapz 4 69 (1/10/2012 12:20:08 PM) comp.soft-sys.matlab hello i have some trouble computing dtft of signal x using an approximation trapz function any ideas? thx yossi ... yossikfir (18)

Angle between line and axis 9 93 (1/10/2012 1:43:08 PM) comp.soft-sys.matlab Hello! How I can calculate angle between line and x axis in Matlab. For instance, I have point P1 with coordinate x1 = 20; y1=35 and point P2 with coordinates x2=68 and y2= 25. I can draw line between these p... suzana.petrovic (10)

How to call Simulink model block from within c-mex s-function? 10 44 (1/10/2012 7:35:08 PM) comp.soft-sys.matlab I have a system that consists of a Simulink model containing 2 main blocks: ~ my c-mex s-function block, which contains a controller that calculates muscle activation outputs ~ a biomechanical ... kmj.work (159)

find and replace a value between two arrays 1 60 (1/11/2012 1:27:08 AM) comp.soft-sys.matlab Hi, I have two arrays. The first is like this : A=[1,0;1,0;1,0;2,0;2,0;3,0;3,0;3,0;3,0] The second is like this B=[1,'M';2,'F';3,'M';4,'F'] The problem i have is to make an algorithm : to replace in A... qwerty6542 (14)