Texas Instruments voyage 200 User Manual - Page 873
ShowStat, simult, Optionally, any matrix element is treated as zero
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ShowStat CATALOG ShowStat Displays a dialog box containing the last computed statistics results if they are still valid. Statistics results are cleared automatically if the data to compute them has changed. Use this instruction after a statistics calculation, such as LinReg. {1,2,3,4,5}! L1 ¸ {0,2,6,10,25}! L2 ¸ TwoVar L1,L2 ¸ ShowStat ¸ {1 2 3 4 5} {0 2 6 10 25} sign( ) MATH/Number menu sign(expression1) ⇒ expression sign(list1) ⇒ list sign(matrix1) ⇒ matrix For real and complex expression1, returns expression1/abs(expression1) when expression1ƒ 0. sign(ë 3.2) ¸ sign({2,3,4,ë 5}) ¸ sign(1+abs(x)) ¸ ë 1. {1 1 1 ë 1} 1 Returns 1 if expression1 is positive. Returns ë 1 if expression1 is negative. sign(0) returns „1 if the complex format mode is REAL; otherwise, it returns itself. sign(0) represents the unit circle in the complex domain. If complex format mode is REAL: sign([ë 3,0,3]) ¸ [ë 1 „1 1] For a list or matrix, returns the signs of all the elements. simult( ) MATH/Matrix menu simult(coeffMatrix, constVector[, tol]) ⇒ matrix Returns a column vector that contains the solutions to a system of linear equations. coeffMatrix must be a square matrix that contains the coefficients of the equations. constVector must have the same number of rows (same dimension) as coeffMatrix and contain the constants. Optionally, any matrix element is treated as zero if its absolute value is less than tol. This tolerance is used only if the matrix has floating-point entries and does not contain any symbolic variables that have not been assigned a value. Otherwise, tol is ignored. • If you use ¥ ¸ or set the mode to Exact/Approx=APPROXIMATE, computations are done using floating-point arithmetic. Solve for x and y: x + 2y = 1 3x + 4y = ë 1 simult([1,2;3,4],[1;ë 1]) ¸ [ë23] The solution is x=ë 3 and y=2. Solve: [a,b;c,d]! matx1 ¸ simult(matx1,[1;2]) ¸ ax + by = 1 cx + dy = 2 [ac bd] ëaø(2døìbbìødc) 2ø aì c aø dì bø c • If tol is omitted or not used, the default tolerance is calculated as: 5Eë 14 ù max(dim(coeffMatrix)) ù rowNorm(coeffMatrix) Appendix A: Functions and Instructions 875