Texas Instruments TI89TITANIUM User Manual - Page 814

DrwCtour CATALOG DrwCtour expression DrwCtour list Draws contours on the current 3D graph at the z values specified by expression or list. The 3D graphing mode must already be set. DrwCtour automatically sets the graph format style to CONTOUR LEVELS. By default, the graph automatically contains the number of equally spaced contours specified by the ncontour Window variable. DrwCtour draws contours in addition to the defaults. To turn off the default contours, set ncontour to zero, either by using the Window screen or by storing 0 to the ncontour system variable. In 3D graphing mode: (1/5)x^2+(1/5)y^2ì10!z1(x,y) ¸ Done L10!xmin:10!xmax ¸ 10 L10!ymin:10!ymax ¸ 10 L10!zmin:10!zmax ¸ 10 0!ncontour ¸ 0 DrwCtour {L9,L4.5,L3,0,4.5,9} ¸ Use the cursor to change the viewing angle. Press 0 (zero) to return to the original view. To toggle between different graph format styles, press ¥ Í í e^() Press X, Y, or Z to look down the corresponding axis. ^ key mantissaEexponent Enters a number in scientific notation. The number is interpreted as mantissa × 10exponent. Hint: If you want to enter a power of 10 without causing a decimal value result, use 10^integer. 2.3í 4 ¸ 2.3í 9+4.1í 15 ¸ 3ù 10^4 ¸ 23000. 4.1í 15 30000 ¥ s key e^(expression1) ⇒ expression e^(1) ¸ e Returns e raised to the expression1 power. Note: On the TI-89 Titanium, pressing ¥ s to display e^( is different from pressing j [E ] . On the Voyage 200, pressing 2s to display e^ is different from accessing the character e from the QWERTY keyboard. e^(1.) ¸ e^(3)^2 ¸ 2.718... e9 You can enter a complex number in reiq polar form. However, use this form in Radian angle mode only; it causes a Domain error in Degree or Gradian angle mode. e^(list1) ⇒ list Returns e raised to the power of each element in list1. e^({1,1.,0,.5}) ¸ {e 2.718... 1 1.648...} e^(squareMatrix1) ⇒ squareMatrix e^([1,5,3;4,2,1;6,ë2,1]) ¸ Returns the matrix exponential of squareMatrix1. This is not the same as calculating e raised to the power of each element. For information about the calculation method, refer to cos(). 768820..250496 559.617 488.795 435966..550291 524.929 371.222 307.879 squareMatrix1 must be diagonalizable. The result always contains floating-point numbers. 814 Appendix A: Functions and Instructions