One of the most common numerical kernels is the dot product. Given two vectors (r1,x2, ..., xn) and (y1, Y2, .. Yn), their dot product is
One of the most common numerical kernels is the dot product. Given two vectors (r1,x2, ..., xn) and (y1, Y2, .. Yn), their dot product is
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![One of the most common numerical kernels is the dot product. Given two vectors (21, 2,..., 2n)
and (y1, Y2, ... , Yn), their dot product is
x1yı + x2Y2 + ·+ xnYn.
Starting with the code
dot.c
double dot (const double *const x, const double *const y, const long int n)
{
write a C function dot () that returns the dot product of the vectors x and y. The latter are
pointers to two C arrays of length n. Do not change the signature of the function. Be sure
to accumulate the answer in double precision.
The const declaration in const long int n means that n cannot be changed in the
function. The declaration const * const x means that x is a constant pointer to constant
values. That is, we cannot change x nor anything it points to (e.g., x[0]).
What to do
Create your C code in a file named dot.c. If you want to test it while keeping your test
code in a separate file, here is how you do it. If your test code (including main()) is in the
file main.c, then you can build an executable with
gcc -Wall -pedantic -o dot main.c dot.c
./dot
You can compile your dot.c into object code, the first step in building an executable, with
the command
gcc -Wall -pedantic -c dot.c
./dot
This will create a file dot.o.
Submit your file dot.c and the corresponding Linux object file dot.o to the autograder
on Gradescope for grading. An object file built on a Mac or a Windows system will not
work in a Linux environment such as Gradescope.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F82cc6127-5e60-4457-a501-c75392fa956a%2F9d0b78ba-cc38-4f73-8417-992c0fae1365%2Fkd4xa2i_processed.jpeg&w=3840&q=75)
Transcribed Image Text:One of the most common numerical kernels is the dot product. Given two vectors (21, 2,..., 2n)
and (y1, Y2, ... , Yn), their dot product is
x1yı + x2Y2 + ·+ xnYn.
Starting with the code
dot.c
double dot (const double *const x, const double *const y, const long int n)
{
write a C function dot () that returns the dot product of the vectors x and y. The latter are
pointers to two C arrays of length n. Do not change the signature of the function. Be sure
to accumulate the answer in double precision.
The const declaration in const long int n means that n cannot be changed in the
function. The declaration const * const x means that x is a constant pointer to constant
values. That is, we cannot change x nor anything it points to (e.g., x[0]).
What to do
Create your C code in a file named dot.c. If you want to test it while keeping your test
code in a separate file, here is how you do it. If your test code (including main()) is in the
file main.c, then you can build an executable with
gcc -Wall -pedantic -o dot main.c dot.c
./dot
You can compile your dot.c into object code, the first step in building an executable, with
the command
gcc -Wall -pedantic -c dot.c
./dot
This will create a file dot.o.
Submit your file dot.c and the corresponding Linux object file dot.o to the autograder
on Gradescope for grading. An object file built on a Mac or a Windows system will not
work in a Linux environment such as Gradescope.
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