Frequently Asked Questions

1. Select Settings from the Options menu to bring up the Global Settings dialog box.
2. Increase the number in the field marked "AutoRedraw On--Draw Last ___ equations" to anything up to 999.

1. Using notepad or your favorite text editor, open your graphmat.ini file (this should be in the same directory you installed the program in; if you don't have one, Save Setup Info in the File menu will create it for you).
2. Under the [options] section add the lines:

   	maxeqs=n
   	autonum=n
   

   where n is the number of equations you want to be able to handle at once. You can enter anything up to 999.

	y=-x {,-1}
	y=x^2 {-1,1}
	y=2-x {1,}

1. Switch the range of the x axis to something appropriate for degree measure, e.g. -360 to 360.
2. Multiply any references to the variable "x" or constants in degrees by the constant "d", e.g.

       y= cos (x*d-30d)
   

   will graph cosine with a 30 degree phase shift.

	{a: 1, 2, 3}  NOT  {a:1,2,3}

	(x0-x1)y = (y0-y1)x + x0*y1 - x1*y0

For example, the line between (1, 2) and (4, 3) would be given by the equation:

	(1-4)y = (2-3)x + 1*3 - 4*2

	3y = x + 5

To draw a line segment instead of a line across the entire coordinate plane, simply add a domain bounded by the X coordinate of either endpoint:

	(x0-x1)y = (y0-y1)x + x0*y1 - x1*y0 {x0, x1}

If you want to preserve your configuration as-is without saving any future changes you may make, you can simply turn this off (running under the admin account) by unchecking the "Save Settings on Exit" box at the top of the "General" tab in the Global Settings dialog box (Options/Settings menu item). This will write out the settings file one last time, after which you can run in the limited user account and it will not attempt to write to the file anymore.

On the other hand, if you'd like to support multiple user accounts, each with its own independent configuration, you can do so as follows:

• Install under the admin account so the program files and start menu shortcut are available to all users.
• Modify the shortcut to Graphmatica.exe created by the installer to include the command-line parameter "/i:%USERPROFILE%\graphmat.ini" (be sure to include the quotes in the shortcut, as the USERPROFILE directory names generally contain spaces). This will allow each user to save their own copy of graphmat.ini in their personal settings directory.