HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 272
NUM key, SHIFT NUM key, VIEWS key
UPC - 882780045217
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hp40g+.book Page 20 Friday, December 9, 2005 1:03 AM NOTE NUM key SHIFT NUM key VIEWS key This operation supposes that the current variable is also the variable of the function or curve you want to graph. When the expression is copied, it is evaluated, and the current variable (contained in VX) is changed to X, T, or θ, depending on the type of plot you chose. If the function depends on a parameter, it is preferable to give the parameter a value before pressing . If, however, you want the parameterized expression to be copied with its parameter, then the name of the parameter must consist of a single letter other than X, T, or θ, so that there is no confusion. If the highlighted expression has real values, the Function, Aplet or Polar Aplet can be chosen, and the graph will be of Function or Polar type. If the highlighted expression has complex values, the Parametric Aplet must be chosen, and the graph will be of Parametric type. To summarize. If you choose: • the Function Aplet, the highlighted expression is copied into the chosen function Fi, and the current variable is changed to X. • the Parametric Aplet, the real part and the imaginary part of the highlighted expression are copied into the chosen functions Xi,Yi, and the current variable is changed to T. • the Polar Aplet, the highlighted expression is copied into the chosen function Ri and the current variable is changed to θ. Pressing in the Equation Writer causes the highlighted expression to be replaced by a numeric approximation. puts the calculator into approximate mode. Pressing in the Equation Writer causes the highlighted expression to be replaced by a rational number. puts the calculator into exact mode. Pressing in the Equation Writer enables you to move the cursor with the and arrow keys to see the entire highlighted expression. Press to return in the Equation Writer. 15-20 Equation Writer