MUMPS Examples

MUMPS ("Massachusetts General Hospital Utility Multi-Programming System"), or M, is a general-purpose computer programming language originally designed in 1966 for the healthcare industry. Its differentiating feature is its "built-in" database, enabling high-level access to disk storage using simple symbolic program variables and subscripted arrays; similar to the variables used by most languages to access main memory. Read more...

The implementations currently available are:

• Intersystems (Caché)
• FIS (GT.M)
• MUMPS Database and Language by Ray Newman
• Open Mumps

The examples in this tutorial are run with GT.M.

Prerequisites

• GT.M Administration and Operations Guide
• The GT.M Programmer's Guide
• GT.M Message and Recovery Procedures Manual
• MUMPS Technology Portal

Additional Documentation

• Sourceforge

GPL Mumps

• The Mumps Programming Language
• Mumps Language Users' Guide
• Mumps Language Quick Introduction & Tutorial

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Quick Setup

To install GT.M on Debian based OS:

apt-get install fis-gtm

Set up the environment variables:

cd /usr/lib/x86_64-linux-gnu/fis-gtm/V6.3-003A_x86_64
source gtmprofile

Open the GT.M prompt:

gtm

GTM>write "Hello world"
Hello world
GTM>halt

To uninstall GT.M:

apt-get purge fis-gtm

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Run the Examples

Copy the examples into your ~/.fis-gtm/V6.3-003A_x86_64/r folder and run:

mumps -run ^HelloWorld

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1. The Very Basics

HelloWorld.m

Hello world

HelloWorldInLoop.m

Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world

HelloWorldInAnotherLoop.m

Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world

HelloWorldInNestedLoop.m

1:1 Hello world
1:2 Hello world
1:3 Hello world
1:4 Hello world
1:5 Hello world
2:1 Hello world
2:2 Hello world
2:3 Hello world
2:4 Hello world
2:5 Hello world

ArithmeticOperations.m

There were 7 apples, 8 pears and 9 oranges,
a total of 24 fruits in a basket.
Then, something happened:
1 apple, 2 pears and 0 oranges were eaten!
Now there are 21 fruits in the basket,
the average fruit value is 7.

Arrays.m

Approaching the solar system:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto

September 2019:
26 27 28 29 30 31 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 1 2 3 4 5 6

Genealogical tree:
Harry and Emily had Jack

Associative array:
Have you ever been to London?

ArraysShortened.m

The output obtained is the same as that in Arrays.m

2. User Defined Functions

FactorialByReference.m

Enter n: 5
5! = 120

FactorialByValue.m

Enter n: 5
5! = 120

Fibonacci.m

Enter n: 9
F(9) = 34

3. Routines

Main.m

Hello!
Enter n: 9

areaCircle(9) = 254.469
fibonacci(9) = 34
factorialByVal(9) = 362880
factorialByRef(9) = 362880

For further details also visit MyMath.m

4. Databases

GenealogicalTree.m

Genealogical tree:
^gtree(0,1,1) is Jessica
$data(^gtree(0,2)) is 0
$data(^gtree(0,1,1,1)) is 1
$data(^gtree(0,0,0,0,0)) is 10
$data(^gtree(0)) is 11

Removing tree...
$data(^gtree(0,2)) is 0
$data(^gtree(0,1,1,1)) is 0
$data(^gtree(0,0,0,0,0)) is 0
$data(^gtree(0)) is 0

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Contributions

Would you help make this tutorial better? Contributions are welcome.

• Feel free to send a pull request
• Drop an email at info@programarivm.com with the subject "Open MUMPS by Example"
• Leave me a comment on Twitter
• Say hello on Google+

Many thanks.