15  Statements and Looping

15.1 Comparison Operators

Comparison operators test a relationship between two values and return TRUE or FALSE. They’re the building blocks of filtering a dataset — e.g. “keep only the fields where yield exceeded 4 t/ha.”

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15.2 Logical Operators

• & — AND (both conditions must be true)
• | — OR (at least one condition must be true)
• ! — NOT (negates a condition)

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15.3 for Loops

A for loop repeats a block of code once for each element in a sequence — useful for running the same check across every field in a season’s data.

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15.4 while Loops

A while loop repeats a block of code as long as a condition remains true — useful when you don’t know in advance how many iterations you’ll need, such as simulating water accumulation until an irrigation threshold is reached.

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Summary

Concept	Description
Statements and Looping
Comparison Operators	`==`, `!=`, `>`, `<`, `>=`, `<=` — test a relationship between two values.
Logical Operators	`&` (AND), `|` (OR), `!` (NOT) — combine or negate conditions.
for Loops	Repeat a block of code once per element of a known sequence, e.g. once per field.
while Loops	Repeat a block of code while a condition holds, useful when the number of iterations isn't known in advance.