PRIME_PLOT
Box Plot of Primes

PRIME_PLOT is a MATLAB program which displays a "box plot" of the prime and composite numbers.

An N by N grid A of squares is displayed. If N is prime, then the squares A(N,1:N) are red. If N is composite, then A(N,D) is blue for each divisor of N.

Usage:

prime_plot ( 'n_max' )

• 'n_max' is the maximum value of N to check. 50 or 100 is reasonable.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

BOX_DISPLAY, a MATLAB program which displays a box plot, over integer pairs of data, of a function defined by two formulas.

PRIME_PARFOR, a MATLAB program which counts the number of primes between 1 and N, running in parallel using MATLAB's parfor feature.

PRIME_SERIAL, a MATLAB program which counts the number of primes between 1 and N, intended as a starting point for the creation of a parallel version.

PRIME_SPMD, a MATLAB program which counts the number of primes between 1 and N; running in parallel using MATLAB's Single Program Multiple Data (SPMD) feature.

Source Code:

• prime_plot.m the source code.

Examples and Tests:

• prime_plot.png, the image created by the command "prime_plot(50)".

You can go up one level to the MATLAB source codes.