Texas Instruments TI-89 User Manual - Page 851
In Radian angle mode, x+3 has one argument., top-level
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P4Rx( ) MATH/Angle menu P4Rx(rExpression, qExpression) ⇒ expression P4Rx(rList, qList) ⇒ list P4Rx(rMatrix, qMatrix) ⇒ matrix Returns the equivalent x-coordinate of the (r, q) pair. Note: The q argument is interpreted as either a degree, gradian or radian angle, according to the current angle mode. If the argument is an expression, you can use ó , G o r ô to override the angle mode setting temporarily. In Radian angle mode: P4Rx(r,q) ¸ cos(q)ø r P4Rx(4,60¡) ¸ 2 P4Rx({ë 3,10,1.3},{p/3,ë p/4,0}) ¸ { } ë 3/2 5ø ‡2 1.3 P4Ry( ) MATH/Angle menu P4Ry(rExpression, qExpression) ⇒ expression P4Ry(rList, qList) ⇒ list P4Ry(rMatrix, qMatrix) ⇒ matrix Returns the equivalent y-coordinate of the (r, q) pair. Note: The q argument is interpreted as either a degree, radian or gradian angle, according to the current angle mode. If the argument is an expression, you can use ó , G o r ô to override the angle mode setting temporarily. In Radian angle mode: P4Ry(r,q) ¸ sin(q)ø r P4Ry(4,60¡) ¸ 2ø ‡3 P4Ry({ë 3,10,1.3},{p/3,ë p/4,0}) ¸ { } ë 3ø ‡3 2 ë 5ø ‡2 0. part() CATALOG part(expression1[ ,nonNegativeInteger]) This advanced programming function lets you identify and extract all of the sub-expressions in the simplified result of expression1. For example, if expression1 simplifies to cos(pù x+3): • The cos() function has one argument: (pù x+3). • The sum of (pù x+3) has two operands: pù x and 3. • The number 3 has no arguments or operands. • The product pù x has two operands: p and x. • The variable x and the symbolic constant p have no arguments or operands. If x has a numeric value and you press ¥ ¸, the numeric value of pù x is calculated, the result is added to 3, and then the cosine is calculated. cos() is the top-level operator because it is applied last. part(expression1) ⇒ number Simplifies expression1 and returns the number of top-level arguments or operands. This returns 0 if expression1 is a number, variable, or symbolic constant such as p, e, i, or ˆ. part(expression1, 0) ⇒ string Simplifies expression1 and returns a string that contains the top-level function name or operator. This returns string(expression1) if expression1 is a number, variable, or symbolic constant such as p, e, i, or ˆ. part(cos(pùx+3)) ¸ Note: cos(pù x+3) has one argument. part(cos(pùx+3),0) ¸ 1 "cos" Appendix A: Functions and Instructions 851