How to resolve the algorithm Nautical bell step by step in the Mathematica/Wolfram Language programming language
How to resolve the algorithm Nautical bell step by step in the Mathematica/Wolfram Language programming language
Table of Contents
Problem Statement
Write a small program that emulates a nautical bell producing a ringing bell pattern at certain times throughout the day. The bell timing should be in accordance with Greenwich Mean Time, unless locale dictates otherwise. It is permissible for the program to daemonize, or to slave off a scheduler, and it is permissible to use alternative notification methods (such as producing a written notice "Two Bells Gone"), if these are more usual for the system type.
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Nautical bell step by step in the Mathematica/Wolfram Language programming language
This Wolfram code sets up a scheduled task to play a sound on the computer. The scheduled task is set to run at 6:30 PM every day.
The sound that is played is a sequence of alternating C notes and rests. The length of each note and rest is determined by the current time. For example, at 6:30 PM, the first note will be 750 milliseconds long, followed by a rest of 500 milliseconds, then another C note of 750 milliseconds, and so on.
The code uses the LocalSubmit
function to submit the scheduled task to the task scheduler. The ScheduledTask
function takes two arguments: the task to be scheduled, and the time at which the task should run.
The task to be scheduled is defined by the EmitSound
function. The EmitSound
function takes one argument: the sound to be played.
The sound to be played is defined by the Sound
function. The Sound
function takes one argument: a list of sound notes.
Each sound note is defined by three values: the pitch of the note, the duration of the note, and the instrument that should be used to play the note.
The pitch of the note is specified by a string. The string can be a note name (such as "C"), a frequency (such as "440 Hz"), or a MIDI note number (such as "60").
The duration of the note is specified by a number. The number is the length of the note in milliseconds.
The instrument that should be used to play the note is specified by a string. The string can be the name of an instrument (such as "TubularBells"), or a MIDI instrument number (such as "1").
The code uses the Table
function to create a list of sound notes. The Table
function takes three arguments: the expression to be evaluated, the range of values for the variable, and the step size.
The expression to be evaluated is a list of two sound notes: a C note and a rest.
The range of values for the variable is the set of integers from 1 to 8.
The step size is 1.
The result of the Table
function is a list of eight sound notes. The first note is a C note with a duration of 750 milliseconds and played on the TubularBells instrument. The second note is a rest with a duration of 500 milliseconds. The third note is another C note with a duration of 750 milliseconds, and so on.
The code uses the Mod
function to calculate the remainder of the current time divided by 8. The result of the Mod
function is a number between 0 and 7.
The result of the Mod
function is used to index into the list of sound notes. The sound note at the specified index is the sound note that will be played.
The code uses the Round
function to round the current time to the nearest 30 seconds. The result of the Round
function is a list of two numbers: the year and the day of the year.
The code uses the Total
function to add the two numbers in the list. The result of the Total
function is the number of days since the beginning of the year.
The code uses the DateList
function to get a list of the date and time components of the current time. The first argument to the DateList
function is a list of the date and time components that you want to get. The second argument to the DateList
function is the number of days since the beginning of the year.
The code uses the [[{4,5}]]{2,1/30}
expression to get the hours and minutes of the current time. The expression [[{4,5}]
gets the fourth and fifth elements of the list returned by the DateList
function. The expression {2,1/30}
gets the second and third elements of the list returned by the [[{4,5}]
expression.
The code uses the DateObject
function to create a date object. The DateObject
function takes one argument: a list of the date and time components of the date.
The code uses the |0
expression to round the minutes of the date object to the nearest zero. The |0
expression is equivalent to the Floor
function.
The resulting date object is the date and time at which the scheduled task will run.
Source code in the wolfram programming language
LocalSubmit[ScheduledTask[
EmitSound[Sound[Table[{
SoundNote["C",750/1000,"TubularBells"],SoundNote[None,500/1000,"TubularBells"]
},Mod[Round[Total[DateList[][[{4,5}]]{2,1/30}]],8,1]]]]
,DateObject[{_,_,_,_,_,30|0}]]]
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