Floating-point operations In general, real numbers (with infinite decimal expansions) cannot be represented exactly in a computer by floating-point numbers (with finite decimal expansions). Suppose that floating-point numbers on a particular computer carry an error of at most 10 –16 . Estimate the maximum error that is committed in doing the following arithmetic operations. Express the error in absolute and relative (percent) terms. a. f ( x , y ) = xy b. f ( x , y ) = x / y c. F ( x , y , z ) = xz d. F ( x , y , z ) = ( x / y ) / z
Floating-point operations In general, real numbers (with infinite decimal expansions) cannot be represented exactly in a computer by floating-point numbers (with finite decimal expansions). Suppose that floating-point numbers on a particular computer carry an error of at most 10 –16 . Estimate the maximum error that is committed in doing the following arithmetic operations. Express the error in absolute and relative (percent) terms. a. f ( x , y ) = xy b. f ( x , y ) = x / y c. F ( x , y , z ) = xz d. F ( x , y , z ) = ( x / y ) / z
Solution Summary: The author calculates the maximum error for f(x,y)=xy and expresses it in absolute and relative terms.
Floating-point operations In general, real numbers (with infinite decimal expansions) cannot be represented exactly in a computer by floating-point numbers (with finite decimal expansions). Suppose that floating-point numbers on a particular computer carry an error of at most 10–16. Estimate the maximum error that is committed in doing the following arithmetic operations. Express the error in absolute and relative (percent) terms.
Consider the following system of equations, Ax=b :
x+2y+3z - w = 2
2x4z2w = 3
-x+6y+17z7w = 0
-9x-2y+13z7w = -14
a. Find the solution to the system. Write it as a parametric equation. You can use a
computer to do the row reduction.
b. What is a geometric description of the solution? Explain how you know.
c. Write the solution in vector form?
d. What is the solution to the homogeneous system, Ax=0?
2. Find a matrix A with the following qualities
a. A is 3 x 3.
b. The matrix A is not lower triangular and is not upper triangular.
c. At least one value in each row is not a 1, 2,-1, -2, or 0
d. A is invertible.
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