# Measure Tutorial

This tutorial gives you a taste of what you can do in Measure.

Here's a short excursion you can try with just the mouse:

1. In the Contents window, double-click "things".
2. In the "things" window, double-click "event".
3. In the "events" window, double-click "war".
4. From the View menu, choose Add Column -> "duration".
5. Click on the "duration" column header to sort by duration.
6. Double-click on the death toll of WWII. The value is added to your Stack window.
7. Then double-click on the death toll of WWI. The value is added to your Stack window.
8. Choose "Measure Stack" from the Window menu to bring it to the front (or click on any exposed part to bring it forward).
9. Click the "-" button (or choose Subtract from the Math menu) to subtract the two values. The result shows how many more people died in World War II than in World War I.
10. Back in the "wars" window, double-click on "World War I" to open a window showing all the information Measure has about that war.

Try typing the following into the Stack window, pressing Return after each one, and watch what happens.

If you get an error message, you can press the Up arrow and edit your entry.

 2+3 No big surprise here. 2 ft + 1 in The result has the units of the last-added value as yardsin yards ...but you can convert it to any compatible units Click the "Convert" button ...or see the result in many different units at once. =feet "=" means the same as "as" or "in," but it's easier to type. 2 yards + 1 foot in inches Calculate and convert in one step.

 43 feet You can enter values first * ...and then operate on them. * \$5/foot You can also operate on them "in place."

 2 foot 1 Displays as a cascade because you typed it that way. Click Cascade to display as decimal feet instead. 2 1/2 ft Displays as a fraction because you typed it that way; click Fraction to display it as a decimal instead. 3/4 This is a fraction. 3 / 4 The extra spaces make this a division operation, rather than a fraction. 3/4 foot Three-quarters of a foot. 3 / 4 foot Three divided by (four feet), or 0.75 per foot. (3 / 4) foot Three-quarters of a foot, again.

 3 3 (exactly). 3. 3 plus-or-minus one-half. 3.5 3.5 plus-or-minus 0.05. 3.5. 3.5, exactly. (Choose View > Show All Uncertainties to see the difference.)

 now - date 4-Jul-1967 Your age if you were born on July 4, 1967. Use "@" in place of the word "date", if you wish. Click the "Convert" button Your age expressed in various units.

 500. gallons per week * 2 days There is no need to worry about the number of days in a week, since Measure takes care of that for you.

 heights Lists the name and height of every item in the database whose height is known. heights of buildings Lists the name any height of every building in the database whose height is known. density < water Lists all items in the database whose densities are less than the density of water. density > 2.0 g/cc Lists all items in the database whose densities are greater than the given value. in = Nevada Lists all the items in the database whose "in" ("in location") attribute is Nevada. orbits = sun Lists all the items in the database that orbit the sun.

 6 2/3 cubic inches per second per hour You can combine units to make more complex units =gal/sec^2 ...and convert to other compatible units.

 ?planet "?" means to open the specified item (rather than a list of such items).

See also Examples, Reference, and Help.

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