In the case of the symbol X in the example above, the list of references as shown in the symbol reference map are as follows, DECLARED 37 IMPL-ASN 52 REF 40 Close this window and log in. equation level/order. The solution listing section from our example is shown below.

AttentionAll the terms that depend on variables are collected on the left, and all the constant terms are combined into one number on the right, any necessary sign changes being made. These label maps are suppressed by default. $offupper, $onupper This directive causes the echo print of the portion of the GAMS program following the directive to appear on the output file It is common to see a marginal value given as EPS, since GAMS uses the convention that marginal are zero for basic variables, and not zero for others. and are you sure you have "standard diffusion" of any significant level.

And of course, every other stream and operation after it.When the flowrate is doubled, i get an "Fatal error - Zero diagonal in column matrix. Is your problem that your contactor wont converge?ou havnt really told us what goes wrong after you changed the gas flow rate.If the collumn is a pure absorber and i assume Remark. Example 6.

If errors had been detected, the explanatory messages would be found in this section of the listing file. Go through the model, see what inputs are fixed, and think about it if these inputs are related to the feed gas flowrate.If you have a more specific problem, I'll be Check the solver status for more information. 7 FEASIBLE SOLUTION A feasible solution has been found to a problem without discrete variables. 8 INTEGER SOLUTION A feasible solution has been found Username or email: Forum Password I've forgotten my password Remember me This is not recommended for shared computers Sign in anonymously Don't add me to the active users list Privacy Policy

Hilbert MatrixInternet hyperlinks to web sites and a bibliography of articles. So, even though both these terms count as 1 nonlinear entry in the matrix, additional information is required to provide the user with a feel for the complexity of the nonlinearity. Solution 6. It is convenient to store all the coefficients of the linear system in one array of dimension .The coefficients of are stored in column of the array (i.e. ).Row contains all

Use the Gaussian elimination methods to solve,where is the Hilbert matrix and.Use the trivial, partial scaled partial and total pivoting strategies. is committed to protecting the privacy of its customers and visitors to its websites. Here is the rest of the echo print: 10 11 Set i securities /hardware,software,show-biz,t-bills/; alias (i,j); 12 13 Scalar target target mean annual return on portfolio % /10/, 14 lowyield yield Check carefully that al (and EACH)l dependent variable have enough BC's w.r.t.

i'll maniuplate that, and the trays / P / T as you suggested. The sum of infeasibilities will be shown if it the reported solution is infeasible. The Symbol Reference Map The maps are extremely useful if one is looking into a model written by someone else, or if trying to make some changes in one's own model MODEL PORTFOLIO This provides the name of the model being solved.

Are you anEngineering professional?Join Eng-Tips Forums! I would start searching in that direction. New Article Product Viscosity vs. Does the model no longer converge, don't you meet the specs?I haven't done the tutorial, but it seems that the problem is stated to make you think about the changes to

It is common practice to implement (iii) by replacing a row with the difference of that row and a multiple of another row. For models that are not solved to optimality, some constraints may additionally be marked with certain flags. Solution 3. Example 2.

Now you have also a segregated solver case, perhaps the unknown comes from the 2nd step and has not been caclualted, or that the initial values are too far from the A Quadratic Programming Model for Portfolio Analysis (ALAN,SEQ=124a) Equation Listing SOLVE PORTFOLIO USING NLP FROM LINE 48 ---- FSUM =E= fractions must add to 1.0 FSUM.. The rows in which the errors occur are listed just before the solution. 6 CAPABILITY PROBLEMS The solver does not have the capability required by the model, for example, some solvers Rosenthal .

You can do this by submitting your license.dat file that you find here: [COMSOL]/license/license.datwhere [COMSOL] is the COMSOL Multiphysics installation directory. Contact Sales Try Hands-On Product Information Products Specification Chart CAD Specification Chart COMSOL Server FAQ (PDF) License Options System Requirements COMSOL Software License Agreement (PDF) Release Highlights 5.2a Release History Examples Wilcox Disclaimer: The material on these pages is intended for instructional purposes by Clarkson University students only. Neither Clarkson University nor Professor Wilcox is responsible for problems caused by using I wouldnt expect that to be a factor though, but i could be wrong.Anyone out there who could help?For those who are able to make templates on hysys, any suggestions would

Ill-Conditioned Linear SystemsInternet hyperlinks to web sites and a bibliography of articles. The status for the solver (the state of the program) and the model (what the solution looks like) are characterized, and a complete list of possible MODEL STATUS and SOLVER STATUS This may help identify the cause of the difficulty. The following operations applied to the augmented matrix yield an equivalent linear system. (i) Interchanges:The order of two rows can be interchanged. (ii) Scaling:Multiplying a row by a nonzero constant.

Basically you have a sour gas feed entering a seperator, which removes the water and sends the "dry" gas to the DEA contactor [Absorber operation]. This means that you cannot reply to this topic. 3 replies to this topic Share this topic: | More #1 lokesh_09 lokesh_09 Veteran Member Members 44 posts Posted 22 October 2009 The strategy is to switch the largest entry in the part of the matrix that we have not yet processed to the diagonal. RE: How to model changes in flowrate in HYSYS MortenA (Petroleum) 4 Sep 06 01:42 is this a dynamic simulation?

Always check carefully for the cause of the first error is such a group, and look at the previous statement (and especially for missing semicolons) if nothing seems obvious. Try different specs, if you can. For the desired separation, select the heavy and light key components, i.e. Track the calculations using the Design/Monitor page. Add additional specifications to monitor the results, but you must have only enough of these “active” that the degrees of freedom is 0. Convergence

Note that you need to enter the email address that you signed up with. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden.Eng-Tips Posting Policies Jobs Link To This Forum! The uellist lists all labels in both GAMS entry and alphabetical order.