This dialog box is displayed when you click the Scale Data... button in the HOURLY DATA panel. It allows you to algorithmically alter the current hourly weather data.
Hourly Data Set to Scale
Use this selector to choose the weather data parameter you wish to apply your scaling or modification to.
Z=
This must be a valid mathematical equation. You can use the single-character variables given immediately below and an whole range of math functions, as outlined at the bottom of this page. A list of your last 10 used equations is retained for later use.
Available Variables
This list details the variables you can use in your modifying equations. Each variable is included in the equation as a single character, either lower or upper case.
Apply to Dates
Use these sliders to select the starting and ending days that are to be affected by the modifying equation. These dates are inclusive, starting on the From day and stopping after the To day.
Apply to Times
Use these sliders to select the starting and ending hours that are to be affected by the modifying equation on each of the selected days. These hours are inclusive, starting on the From hour and stopping after the To hour.
Entering Solvable Equations
The Weather Tool passes this equation through its own equation parser. This allows you to enter numeric values directly or, more typically, use a solvable mathematical equations of any complexity. For example, you could simply add up several numbers by entering:
Z + (55.6 + 16.8 + (15/4.55))
or use more complex mathematical functions such as:
Z + TRUNC(55.6 * (TAN(PI/12) + SIN(PI/6)))
All directly entered decimal values are assumed to be in floating point notation. As a result, any of the following are valid and equivalent input values: 900, 900.0, 9e2, 9E2.0 or 900.000000.
Equation Functions
The following is a list of mathematical functions available within the equation parser. Within the brackets, x represents a decimal value or any number of other functions, as long as the resulting equation is resolvable.
It should be noted again that all angles used within any trigonometric function must be in radians, even if the calculated result is to be in degrees. This is because the internal math functions use radians exclusively.