contradiction between matrix eigenvalues and rank calculations?
I am working with a semi-positive 413 x 413 input-output table from the Bureau of Economic Analysis.When I use the default precision in MathCad 14, I get that the rank is 410 and I find that there are...
View ArticleRe: contradiction between matrix eigenvalues and rank calculations?
Values on the order of 10^-17 to 10^-18 are just errors due to numeric roundoff. Ignore them, as the rank function does.
View ArticleRe: contradiction between matrix eigenvalues and rank calculations?
Thank you, that is most helpful.
View ArticleGross Weight Estimation
My team and I are stumped in a section of our design process. We are currently trying to estimate the gross weight of our designs (step 2.1.1.1). We have tools necessary for our design, (i.e. the...
View ArticleRe: CREO RESTARTS MY COMPUTER EVERY TIME I RUN IT
Fixed... The information I obtained is mostly from http://communities.ptc.com/thread/37682 and actually answered by Mark S. Fischer. Thank you for the help Eric, Hugo, and others within the forum whom...
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Re: Started Off Fine And Then Things Are Working In Slow Motion Now!
Hey Everybody, Things seem to be working fine now. I think part of my problem was with the "Enhanced Realism" button. When I turn that off I can maniputlate my drawings the in real time. Poor graphics...
View ArticleRe: Is windchill capable of managing NX/CAE Data? (*.prt, _i.prt, *.fem, *.sim)
Still looking for some NX/CAE/Windchill feedback. Anyone?
View ArticleRe: contradiction between matrix eigenvalues and rank calculations?
However, when I increase the precision of the result, the last three eigenvalues come in as nonzero, on the order of E-17 and E-18.I think you are confusing precision of calculation and number of...
View ArticleRe: Is windchill capable of managing NX/CAE Data? (*.prt, _i.prt, *.fem, *.sim)
Probably not, or PTC sales would have mentioned it. Try PTC User, the other support site.
View ArticleCan not create an assembly with the Creo 2.0 Student Edition?
Hi, I am new to using the creo 2.0 student edition and can not create an assembly. when I create a New Assembly and save the assembly the screen does not change to the assembly tool bar? Do I need...
View ArticleRe: Can't open Mathcad file saving with XMT extension.
Thank you for the responses. They all helped. I opened MC Prime2.0 and made sure I was opening the converted file (.mcdx). Prime2.0 returned with an error message something like "File not supported"...
View ArticleRe: Finding Root
You are welcome.Depending on the precison you need you may also consider to replace the simple linear interpolation by something else. See attached sheet for cubic splines interpolation and a couple of...
View ArticleRe: A ToolBox for Creo Parametric ??
You must have additional licenses, Rohit. I only see Pro|E, WF, and Creo downloads at that link.
View ArticleRe: Increasing surface patches when exporting in STEP/IGES format
Typically, only facet files will have control of the number of triangles generated to show smoothness. Facet files are not very good for subsequent work, however. Step is probably the most portable...
View ArticleCan we still buy Mathcad 15 ?
The question is in the title!I am playing with Mathcad Prime 2.0 trial and Mathcad 15 trial and Mathcad 15 seems to be more interesting for me.I don't want to spend $1,500 US for Mathcad Prime 3.0 it...
View ArticleRe: Can we still buy Mathcad 15 ?
IIf you purchase Prime 3.0 you get Mathcad 15 free. Mike
View ArticleWind Turbine with Spline Points
Hello all, I'm trying to do an exercise where I have a set of pairs of spline points which correspond to different sections of a wind turbine blade. I've managed to define a set of co-ordinate axis and...
View ArticleRe: Wind Turbine with Spline Points
On YouTube: watch?v=RNqQUIM_X2E Making Wings in ProEngineer by Decaff2010 (Go UIUC Aero department)watch?v=HPVD34gp90E Pro/Engineer Propeller Tutorial also by Decaff2010
View ArticleRe: Wind Turbine with Spline Points
Hi Ryan, Create a surface feature with a curve through the points and make sure you have a closed loop. Extrude the surface to the desired length. Use the fill feature to fill in the ends of the...
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