Octave keyboard input function to filter concatenated string and integer? -

if write 12wkd3, how choose/filter 123 integer in octave?

example in octave:

a = input("a?\n")   a?   12wkd3    = 123

while 12wkd3 user keyboard input , a = 123 expected answer.

assuming general form you're looking taking arbitrary string user input, removing non-numeric, , storing result integer:

a = input("a? /n",'s'); = int32(str2num(a(isdigit(a))));

example output:

a? 324bhtk.p89u34 = 3248934

to clarify what's written above:

in input statement, 's' argument causes answer stored string, otherwise it's evaluated octave first. inputs produce errors, others may interpreted functions or variables.
isdigit(a) produces logical array of values a 1 character 0-9 number, , 0 otherwise.

isdigit('a1 3 b.') = [0 1 0 1 0 0 0]
a(isdigit(a)) produce substring using values corresponding 1 in logical array above.

a(isdigit(a)) = 13
that still returns string, need convert number using str2num(). that, however, outputs double precision number. integer can use int32()

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