Texas Instruments TI-89 Tip List page 488

PxlLine
rowStart,colStart,rowEnd,colEnd[,drawMode]
Display Graph screen and draw line from pixel
coordinates (rowStart,colStart) to (rowEnd,
colEnd), including both endpoints.
If drawMode = 1, draw the line (default).
If drawMode = 0, turn the line pixels off.
If drawMode = -1, invert the line pixels.
PxlOff
row,col
rowList,colList
Display the Graph screen and turn off the pixel
at pixel coordinates (row,col).
PxlOn
row,col
rowList,colList
Display Graph screen and turn on the pixel at
pixel coordinates (row,col).
PxlTest()
(row,col), (rowList,colList)
Return True if the pixel at pixel coordinates
(row,col) is on, otherwise return False.
PxlText string,row,col
Display Graph screen and place string with the
upper-left corner of the first character at the
pixel coordinates (row,col)
PxlVert col[,drawMode]
Display Graph Screen and draw vertical line at
pixel coordinate col.
If drawMode = 1, draw the line (default).
If drawMode = 0, turn the line pixels off.
If drawMode = -1, invert the line pixels.
QR matrix,qMatName,rMatName[,tol]
Calculate Householder QR factorization of real
or complex matrix. The Q and R result matrices
are stored to the matName variables: Q is
unitary, R is upper triangular. If the matrix has
floating-point elements and no symbolic
variables, then any matrix element less than tol
is set to zero. The default value for tol is
5E-14 * max(dim(matrix)) * rowNorm(matrix).
Computations are done with floating-point
arithmetic if the mode is Approximate.
QuadReg
xlist,ylist[,[freqList],[catlLst],[catincList]]
Calculate quadratic polynomial regression and
update all statistics variables. First four
arguments must be variable names or c1-c99.
Last argument need not be a variable name and
cannot be c1-c99. All lists except catincList
must have equal dimension. The regression
2
equation is y = ax + bx + c.
QuartReg
xlist,ylist[,[freqList],[catlLst],[catincList]]
Calculate quartic polynomial regression and
update all statistics variables. First four
arguments must be variable names or c1-c99.
Last argument need not be a variable name and
cannot be c1-c99. All lists except catincList
must have equal dimension. The regression
4
equation is y = ax + bx
θ θ θ θ
R▶ ▶ ▶ ▶ P
()
(xExpr,yExpr), (xList,yList)
(xMatrix,yMatrix)
θ θ θ θ
Return the -coordinate of the (x,y) arguments,
as either a radian or degree angle, depending
on the current Angle mode.
R▶ ▶ ▶ ▶ Pr()
(xExpr,yExpr), (xList,yList), (xMatrix,yMatrix)
Return the r-coordinate of the (x,y) arguments.
rand([n])
n is a non-zero integer. With no argument,
return the next random number between 0 and 1
in the sequence. When n>0, return random
integer in the interval [1,n]. When n<0, return
random integer in the interval [-n,-1].
randMat(numRows,numColumns)
Return matrix with dimensions (numRows,
numColumns) whose elements are random
integers between -9 and 9.
randNorm(mean,sdev)
Return floating-point number from the standard
distribution with mean and standard deviation
sdev.
randPoly(var,order)
Return a polynomial of order in var whose
coefficients are random integers from -9 to 9,
where the leading coefficient is not zero.
RandSeed n
Reseed the random number generator. If n = 0,
reseed with the factory defaults. Otherwise, n is
3 2
+ cx + dx + e.
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