octave: Looping Over Structure Elements
10.5.1 Looping Over Structure Elements
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A special form of the ‘for’ statement allows you to loop over all the
elements of a structure:
for [ VAL, KEY ] = EXPRESSION
BODY
endfor
In this form of the ‘for’ statement, the value of EXPRESSION must be a
structure. If it is, KEY and VAL are set to the name of the element and
the corresponding value in turn, until there are no more elements. For
example:
x.a = 1
x.b = [1, 2; 3, 4]
x.c = "string"
for [val, key] = x
key
val
endfor
⊣ key = a
⊣ val = 1
⊣ key = b
⊣ val =
⊣
⊣ 1 2
⊣ 3 4
⊣
⊣ key = c
⊣ val = string
The elements are not accessed in any particular order. If you need
to cycle through the list in a particular way, you will have to use the
function ‘fieldnames’ and sort the list yourself.
Info Catalog
octave: The for Statement