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Octave Symbolic package: assign `nan` to symfun

From: NVS Abhilash
Subject: Octave Symbolic package: assign `nan` to symfun
Date: Mon, 6 Feb 2017 05:59:32 -0800 (PST)

I am using the symbolic package, I have installed `2.5.0` from the source
[1]. I get this error in Octave 4.3.0+

syms x;
f(x) = nan
error: subscript indices must be integers or boolean
error: called from
    subsindex at line 64 column 5


I am a bit confused. Is this expected?
But if I do
syms x;
f(x) = nan + x
f(x) = (symfun) nan

Maybe Octave cannot identify `f(x) = nan` to be a symfun. But it gets to
know that when we do `f(x) = nan + x` because x is a symbol.

Is it a bug, or is it expected?


NVS Abhilash
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