发货地址:北京海淀
信息编号:207636704,公司编号:14832749
产品规格:不限
产品数量:9999.00 套
包装说明:不限
产品单价:面议
官方网址:http://turntech8843.b2b168.com/
科学软件网专注提供科研软件。截止目前,共代理千余款,软件涵盖各个学科。除了软件,科学软件网还提供课程,包含34款软件,66门课程。热门软件有:spss,stata,gams,sas,minitab,matlab,mathematica,lingo,hydrus,gms,pscad,mplus,tableau,eviews,nvivo,gtap,sequncher,simca等等。
It is important to emphasize the presence of the semicolon at the end of the first line. Without it, the GAMS compiler would
attempt to interpret both lines as parts of the same statement. (GAMS would fail to discern a valid interpretation, so it would
send you a terse but helpful error message.)
The effects of the first statement above are to declare the parameter c, to specify the domain (i,j), and to provide some
documentary text. The second statement assigns to c(i,j) the product of the values of the parameters f and d(i,j).
Naturally, this is legal in GAMS only if you have already assigned values to f and d(i,j) in previous statements.
The direct assignment above applies to all (i,j) pairs in the domain of c. If you wish to make assignments for specific
elements in the domain, you enclose the element names in quotes. For example,
If you submit a file containing the statements above as input to the GAMS program, the transportation model will be
formulated and solved. Details vary on how to invoke GAMS on different of computers, but the simplest ('no frills') way to
call GAMS is to enter the word GAMS followed by the input file's name. You will see a number of terse lines describing the
progress GAMS is making, including the name of the file onto which the output is being written. When GAMS has finished,
examine this file, and if all has gone well the optimal shipments will be displayed at the bottom as follows.
Objective Function
This is a reminder that GAMS has no explicit entity called the objective function. To specify the function to be optimized,
you must create a variable, which is free (unconstrained in sign) and scalar-valued (has no domain) and which appears in an
equation definition that equates it to the objective function.
Data Entry by Direct Assignment
The direct assignment method of data entry differs from the list and table methods in that it divides the tasks of parameter
declaration and parameter assignment between separate statements. The transportation model contains the following example
of this method.
Parameter c(i,j) transport cost in thousands of dollars per case ;
c(i,j) = f * d(i,j) / 1000 ;
科学软件网为全国大多数高校提供过产品或服务,销售和售后团队,确保您售后无忧!