I guess the original programmers didn’t plan enough about the whole structure of the system working together. Sometimes, a program generalised to take in parameters is better than several programs doing the same thing but on different database tables. It was basically a careful search-and-replace operation, together with an additional parameter for the financial year in the main() arguments. So I wrote a fooXXXX.c to replace all the foo programs, and corresponding C programs for the rest. Oh you didn’t know? There were programs like foo0809.c, foo0708.c, foo0607.c, and there’s bar0809.c, bar0708.c, bar0607.c … you get the picture. My first goal was to get similar C programs to be replaced by just 1 program. There were “09/10” notations in the database tables and views, in the stored procedures, in the Unix shell scripts, and in the C programs. My problem then was that, this family of programs lived everywhere. The previous financial year would be 08/09, representing April 2008 till March 2009. Thus we have, say, financial year 09/10, representing April 2009 till March 2010. Financial years were represented in “pairs” of years and in 2 digit form. And that program dealt with financial years. I was talking about a family of programs living way longer than its creators at my company in part 1. Frankly speaking, I can’t remember what I wanted to talk about… After much thinking and recalling and tea drinking, it came back to me. To get an output that you had not previously selected, you will need to rerun the simulation by clicking on the purple arrow.Ok, it’s been a long time since part 1. It includes the values of the variables at each different step in the differential variable, in this case, time t.
Selecting "Table" will cause a data table to be generated. The report gives a lot of information including the initial and final values of every variable present, the minimum and maximum values of the variables in the given interval, and the equations you entered. If you select "Report", a summary of the results will be displayed. Selecting different outputs will cause different things to be generated. If you press the pink arrow, a graph of the solution is generated. The simulation will output different things depending on what is selected. When all of the necesary information has been specified, the screen will look like this. Also make sure to click the " ini-finl" button to specify initial and final values for the solution of the differential equations. The information following the X will tell you what variables have not been specified. In the window above, there is a variable that has not been specified, as indicated by the red X. Pressing the " x= +" button brings up a different window in which you can specify other explicit equations in your system. You will also need to specify an initial value for the differential variable. This will bring up a window in which you can enter a differential equation. You can enter equations by pressing the " d(x) +" button.
This will bring up another window, which looks like this.
To use the ODE solver in Polymath, first click Program, then "DEQ Differential Equations". You will now see a window that looks like this.
#Polymath program download software
Polymath Software Polymath ODE Solver Tutorialįirst, launch Polymath which you can download from
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