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Author Topic: Another Question TI-Nspire basic  (Read 3610 times)

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Offline joao9856

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Another Question TI-Nspire basic
« on: January 25, 2013, 04:18:48 pm »
How can i from a number like 9.57 turn into 9?
if you didn't understand please say it.
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Offline ElementCoder

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Re: Another Question TI-Nspire basic
« Reply #1 on: January 25, 2013, 04:22:55 pm »
The nspire has an 'int()' command for that. But you have to be careful int(9.57) gives back 9.  WITH the dot, which can be problematic with comparing sometimes.
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Offline joao9856

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Re: Another Question TI-Nspire basic
« Reply #2 on: January 25, 2013, 04:24:17 pm »
so thats is all what int() command does?(really a question since i never heard of it)
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Offline ElementCoder

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Re: Another Question TI-Nspire basic
« Reply #3 on: January 25, 2013, 04:26:37 pm »
Yes, int() cuts off any decimals (converts it to an Integer). But the nspire literally cuts off the decimals and leaves the dot (.) in place.
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Offline Rhombicuboctahedron

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Re: Another Question TI-Nspire basic
« Reply #4 on: January 25, 2013, 04:28:02 pm »
Quote from: ElementCoder on January 25, 2013, 04:26:37 pm
Yes, int() cuts off any decimals (converts it to an Integer).
More importantly it rounds down
int(9.57)=9
int(-9.57)=-10
Quote from: ElementCoder on January 25, 2013, 04:26:37 pm
But the nspire literally cuts off the decimals and leaves the dot (.) in place.
Well if you were worried about that you could give int(9.57)->approxFraction(5.E-14)
« Last Edit: January 25, 2013, 04:29:30 pm by Rhombicuboctahedron »
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Offline ElementCoder

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Re: Another Question TI-Nspire basic
« Reply #5 on: January 25, 2013, 04:32:12 pm »
Quote from: Rhombicuboctahedron on January 25, 2013, 04:28:02 pm
Quote from: ElementCoder on January 25, 2013, 04:26:37 pm
Yes, int() cuts off any decimals (converts it to an Integer).
More importantly it rounds down
int(9.57)=9
int(-9.57)=-10
Quote from: ElementCoder on January 25, 2013, 04:26:37 pm
But the nspire literally cuts off the decimals and leaves the dot (.) in place.
Well if you were worried about that you could give int(9.57)->approxFraction(5.E-14)
That's very  useful! And yeah, the rounding down is also important indeed.
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Offline lkj

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Re: Another Question TI-Nspire basic
« Reply #6 on: January 25, 2013, 04:32:20 pm »
If you want it to round mathematically instead of always down, use round(integer, digits).
round(-9.4,0)=-9
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Offline excale

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Re: Another Question TI-Nspire basic
« Reply #7 on: January 25, 2013, 04:59:21 pm »
You can also use exact() (exact(9.) => 9 ). Also, 9=9. return true.
« Last Edit: January 25, 2013, 05:00:42 pm by excale »
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Offline joao9856

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Re: Another Question TI-Nspire basic
« Reply #8 on: January 26, 2013, 03:52:19 am »
that exact() would be good but i'm currently using a non CAS version, thanks anyway
« Last Edit: January 26, 2013, 03:52:51 am by joao9856 »
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Offline joao9856

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Re: Another Question TI-Nspire basic
« Reply #9 on: January 28, 2013, 09:49:49 am »
a comand that does the rounding down without the dot is ipart() just found it today!
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Offline Rhombicuboctahedron

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Re: Another Question TI-Nspire basic
« Reply #10 on: January 28, 2013, 03:55:36 pm »
ipart() returns the integer part of the argument
And I think it keeps the dot, because ipart(9.57) returns 9.
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Offline joao9856

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Re: Another Question TI-Nspire basic
« Reply #11 on: January 28, 2013, 04:16:02 pm »
indeed it does leave the dot...
I'm having to much calc
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