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274
Chapter 20: A to Z Function and Instruction Reference
20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 274 of 118
cnorm
vector
Returns the sum of the absolute values of the real or
complex elements in vector.
complex elements in vector.
[
L
1,2,
L
3]¶VEC b
[
L
1 2
L
3]
cnorm VEC b
6
Concatenation:
+
\
stringA
+
stringB
Returns a string consisting of stringB appended
(concatenated) to the end of stringA.
(concatenated) to the end of stringA.
"your name:"¶STR b
your name:
"Enter "+STR b
Enter your name:
cond
MATRX MATH menu
cond
squareMatrix
Returns the condition number of a real or complex
squareMatrix
squareMatrix
, which is calculated as:
cnorm
squareMatrix
¹
cnorm
squareMatrix
L1
The condition number indicates how well-behaved
squareMatrix
squareMatrix
is expected to be for certain matrix
functions, particularly inverse. For a well-behaved
matrix, the condition number is close to 1.
matrix, the condition number is close to 1.
log(cond
squareMatrix
)
indicates the number of digits
that may be lost due to round-off errors in computing
the inverse.
the inverse.
For a matrix with no inverse,
cond
returns an error.
[[1,0,0][0,1,0][0,0,1]]¶MAT1
b
b
[[1 0 0]
[0 1 0]
[0 0 1]]
[0 0 1]]
cond MAT1 b
1
log (Ans) b
0
[[1,2,3][4,5,6][7,8,9]]¶MAT2
b
b
[[1 2 3]
[4 5 6]
[7 8 9]]
[7 8 9]]
cond MAT2 b
1.8
E
14
log (Ans) b
14.2552725051