Question about Texas Instruments TI-89 Calculator
I go through the procedure given in the manual page 57. On displaying the graph I get the following message on the screen "undefined variable".
How do I solve this.
I have a manual in another language than English, so I do no know exactly or remotely what procedure you refer to, but I have recreated an instance where one gets the error you talk about. I give you the picts. When I enter [Diamond][Graph] I get the following message.
The graph independent variable is x by default, yet I entered cos(f). The calculator is expecting a function of x and I give it a function of some as other entity. Hence the error message. On the command line you cannot change the argument of Y1. It is x by default.
Hope it clarifies things.
Posted on Sep 13, 2009
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