Displaying 5 results from an estimated 5 matches for "unchnag".
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unchange
2004 Jul 29
1
Any orthnormal matrix can keep the curve's shape and size unchnaged?
Dear R users,
I want to know, given a curve f in d-dimensional space,
It is possible to keep the curve’s shape and size unchanged by
an arbitrary dxd orthnormal matrix A?
That is, the new curve g = A*f is still the same shape and size as f?
Thanks for your advices and answers.
Fred
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2016 Dec 01
2
Different results for cos,sin,tan and cospi,sinpi,tanpi
...e fix will be in all future versions of R.
oops.... not so quickly, Martin!
Of course, the results then coincide, by sheer implementation.
*BUT* it is not at all clear which of the two results is better;
e.g., if you replace '1.23' by '1' in the above examples, the
result of the unchnaged *pi() functions is 100% accurate,
whereas
R> sapply(c(cos,sin,tan), function(Fn) Fn(1e45*pi))
[1] -0.8847035 -0.4661541 0.5269043
is "garbage". After all, 1e45 is an even integer and so, the
(2pi)-periodic functions should give the same as for 0 which
*is* (1, 0, 0).
For s...
2016 Dec 01
0
Different results for cos,sin,tan and cospi,sinpi,tanpi
...of R.
>
> oops.... not so quickly, Martin!
>
> Of course, the results then coincide, by sheer implementation.
>
> *BUT* it is not at all clear which of the two results is better;
> e.g., if you replace '1.23' by '1' in the above examples, the
> result of the unchnaged *pi() functions is 100% accurate,
> whereas
>
> R> sapply(c(cos,sin,tan), function(Fn) Fn(1e45*pi))
> [1] -0.8847035 -0.4661541 0.5269043
>
> is "garbage". After all, 1e45 is an even integer and so, the
> (2pi)-periodic functions should give the same as for...
2016 Dec 01
1
Different results for cos,sin,tan and cospi,sinpi,tanpi
...not so quickly, Martin!
>>
>> Of course, the results then coincide, by sheer implementation.
>>
>> *BUT* it is not at all clear which of the two results is better;
>> e.g., if you replace '1.23' by '1' in the above examples, the
>> result of the unchnaged *pi() functions is 100% accurate,
>> whereas
>>
>> R> sapply(c(cos,sin,tan), function(Fn) Fn(1e45*pi))
>> [1] -0.8847035 -0.4661541 0.5269043
>>
>> is "garbage". After all, 1e45 is an even integer and so, the
>> (2pi)-periodic functions...
2016 Dec 01
2
Different results for cos,sin,tan and cospi,sinpi,tanpi
Hi,
i try sin, cos, and tan.
> sapply(c(cos,sin,tan),function(x,y)x(y),1.23e45*pi)
[1] 0.5444181 0.8388140 1.5407532
However, *pi results the following
> sapply(c(cospi,sinpi,tanpi),function(x,y)x(y),1.23e45)
[1] 1 0 0
Please try whether the following becomes all right.
diff -ruN R-3.3.2.orig/src/nmath/cospi.c R-3.3.2/src/nmath/cospi.c
--- R-3.3.2.orig/src/nmath/cospi.c 2016-09-15