Graphmatica Tips

Here are some tips on how to use Graphmatica. Please check the Graphmatica Help file for more details on how to use the program. I will try to focus on things that are especially helpful for our class. (Rather than try to break this up into many unmanageable pages, all information is found below. Please be patient while this page loads.) This site will be updated when the new version of the software is available.

 

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Labeling the horizontal and vertical axes

Select the Title... command from the Label Menu

A Dialogue box will appear where you can insert your X and Y axes labels

Your graph will now be labeled nicely

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Copying Graphs Into Word

Choose Copy Graphs WMF from the Edit menu. Select whether you want a color or monochrome copy.

Switch to Word and type CTRL-V or select Paste from the Edit menu. The graph will be inserted into the document. You can resize it to whatever size you want. If you put the graph in to a Word Frame (Word7), you can then move it around on the page and text will wrap around it.

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Changing the x and y axis scale

You can do this in one of two ways:

  1. Zoom in or out with the Zoom Buttons
  2. Select Grid Range... from the View Menu and manually specify the window settings you want. This is useful when you know what your domain and range should be.

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Finding where two graphs intersect

You can now do this very easily in Graphmatica

  1. After graphing the two equations, adjust your viewing window so that the intersection point(s) show up on the screen.
  2. From the Point menu select Find Intersection...


  3. Specify which graphs you want to intersect in the dialog box and click the Calculate button. Graphmatica does the rest.

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Accurately finding when a graph takes on a particular y value

You can now do this very easily in Graphmatica.

  1. After graphing the equation, adjust your window so that the y value that you want to attain is actually shown on the screen. This is important, as Graphmatica will not be able to compute the required value of x otherwise.
  2. From the Point Menu, select the Evaluate... command

  3. Select the equation your are solving, and enter the y value you have in the appropriate box.
  4. Click calculate and Graphmatica will compute the value of x required to produce that y value.

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Accurately plugging in an x value into an equation

  1. Select Evaluate... from the Point menu. A dialog box will appear and you can enter the x value you want to enter. Make sure you enter the x value in the first box as indicated below.
  2. Select the equation you want to work with.
  3. Hit ENTER or click on the Calculate button, the y value that corresponds to that x value will appear.

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Hiding or deleting a graph

Select the graph that you want to hide or delete. You will know that you have selected the correct graph when the status bar at the bottom of the screen indicates a graph has been selected.

When the graph is correctly selected, type
CTRL-H to hide the graph or CTRL-D to delete it. CTRL-H erases the graph from the screen but does not delete it from the graph menu list. CTRL-D erases the graph from the screen AND deletes it from the graph menu list. You can also click the delete button to delete and the hide button to hide graphs.

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Annotating or labeling a graph

Select Annotate... from the Labels menu.

You will see a dialog box appear.

Type in your Annotations and click the Place button. You will be returned to the graph...click on the spot on the graph where you want to have the annotation appear. To move and annotation, double-click on it and then click the Place button.

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Turning the numerical tables on and off

Select Print Tables from the Options menu. A check mark will indicate the tables are displayed. "Uncheck" the option to turn them off.

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Entering lnx and ex into Graphmatica

The lnx function can be entered as:

y=ln(x) The parentheses are necessary

y=ln(x2+4) would be entered as y=ln(x^2+4)

The exponential function ex can be entered as:

y=e^x or y=exp(x)

If you have something like e2x+3, you would enter it as

y=e^(2x+3)

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What does 4.576*10^5 or 5.3*10^13mean?

When you see this, Graphmatica is using Scientific Notation. The examples given mean the following:

4.56*10^-5 = 4.56x10-5

5.3*10^13 = 5.3x1013

Note that Excel will handle this differently. Excel uses the E notation, which is not to be confused with the natural base, e. For example, in Excel

4.56E-5 = 4.56x10-5

5.3E+13 = 5.3x1013


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