Texas Instruments TI-89 User Manual - Page 861
mode setting., or radian angle, according to the current angle
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R4Pq( ) MATH/Angle menu R4Pq (xExpression, yExpression) ⇒ expression R4Pq (xList, yList) ⇒ list R4Pq (xMatrix, yMatrix) ⇒ matrix Returns the equivalent q-coordinate of the (x,y) pair arguments. Note: The result is returned as a degree, gradian or radian angle, according to the current angle mode setting. In Degree angle mode: R8Pq(x,y) ¸ In Gradian angle mode: R8Pq(x,y) ¸ In Radian angle mode: R4Pq(3,2) ¸ R4Pq([3,-4,2],[0,pà4,1.5]) ¸ R4Pr( ) MATH/Angle menu R4Pr (xExpression, yExpression) ⇒ expression R4Pr (xList, yList) ⇒ list R4Pr (xMatrix, yMatrix) ⇒ matrix Returns the equivalent r-coordinate of the (x,y) pair arguments. In Radian angle mode: R4Pr(3,2) ¸ R4Pr(x,y) ¸ R4Pr([3,-4,2],[0,pà4,1.5]) ¸ 4Rad CATALOG/MATH/Angle menu 4 Rad expression Converts an expression to radian angle measure. In Degree angle mode: 1.5 4Rad ¸ In Gradian angle mode: 1.5 4Rad ¸ .02618R .023562R rand( ) MATH/Probability menu rand([n]) ⇒ expression n is an integer ƒ zero. With no parameter, returns the next random number between 0 and 1 in the sequence. When an argument is positive, returns a random integer in the interval [1, n]. When an argument is negative, returns a random integer in the interval [ë n,ë 1]. RandSeed 1147 ¸ Done (Sets the random-number) rand() ¸ rand(6) ¸ rand(ë 100) ¸ .158... 5 ë 49 Appendix A: Functions and Instructions 861