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shift()
Catalog >
Characters introduced at the beginning or
end of string by the shift are set to a space.
sign()
Catalog >
sign(Value1) ⇒ value
sign(List1) ⇒ list
sign(Matrix1) ⇒ matrix
For real and complex Value1, returns
Value1/abs(Value1) when Value1 ≠ 0.
Returns 1 if Value1is positive.Returns −1 if
Value1 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.
For a list or matrix, returns the signs of all
the elements.
If complex formatmode is Real:
simult()
Catalog >
simult(coeffMatrix, constVector[, Tol]) ⇒
matrix
Returns a column vector that contains the
solutions to a system of linear equations.
Note: See also linSolve(), page 81.
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 set the Auto or Approximate mode
to Approximate, computations are done
Solve for x andy:
x + 2y = 1
3x + 4y = −1
The solution is x=−3 and y=2.
Solve:
ax + by = 1
cx + dy = 2
Alphabetical Listing 139
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