|Subject:||Re: Retained Value|
|Date:||Wed, 13 Jul 2016 12:19:30 -0400|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1|
On 07/13/2016 11:44 AM, Thomas D. Dean wrote:
I have some code, that unless I clear all, does not change value when changed.Well, you are fitting polynomials of fourth and eight degree to two points---no good can come out of that.
But your problem has nothing to do with the poly* math: it's just that globals are weird:
1 That's strange---the value didn't change...
undefined OK, we got rid of P.......
1 ..... except that somehow previous value was retained.
I think the explanation is that 'global' is a statement about the variable, and the assignment to this variable should be a separate statement. Apparently multiple in-line assignments don't work that well. If you write it as
it works as expected.
By the way, global only matters when you want some variables to be available within functions, so the usage pattern is
function fun(); global P; ... P... ; end
and it has to be said that the concept of global is a crutch, and should be avoided if possible.
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