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Changed NearestInSpan to NearestWithinSpan and added panic for out of range

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btracey
2013-07-26 17:46:59 -07:00
parent bf960529ac
commit f35f141977
4 changed files with 51 additions and 19 deletions
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11
AUTHORS Normal file
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@@ -0,0 +1,11 @@
# This is the official list of gonum authors for copyright purposes.
# This file is distinct from the CONTRIBUTORS files.
# See the latter for an explanation.
# Names should be added to this file as
# Name or Organization <email address>
# The email address is not required for organizations.
# Please keep the list sorted.
Brendan Tracey <tracey.brendan@gmail.com>

23
LICENSE Normal file
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@@ -0,0 +1,23 @@
Copyright ©2013 The gonum Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the gonum project nor the names of its authors and
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

13
floats.go
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@@ -251,14 +251,13 @@ func Nearest(s []float64, v float64) (ind int) {
// NearestInSpan return the index of a hypothetical vector created
// by Span with length n and bounds l and u whose value is closest
// to v. Assumes u > l
func NearestInSpan(n int, l, u float64, v float64) int {
if v < l {
return 0
}
if v > u {
return n - 1
// to v. Assumes u > l. If the value is greater than u or less than
// l, the function will panic.
func NearestWithinSpan(n int, l, u float64, v float64) int {
if v < l || v > u {
panic("floats: value outside span bounds")
}
// Can't guarantee anything about exactly halfway between
// because of floating point weirdness
return int((float64(n)-1)/(u-l)*(v-l) + 0.5)

23
floats_test.go
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@@ -318,32 +318,31 @@ func TestNearest(t *testing.T) {
}
}
func TestNearestInSpan(t *testing.T) {
ind := NearestInSpan(13, 7, 8.2, -1)
if ind != 0 {
t.Errorf("Wrong value when below the lower bound. %i found, %i expected", ind, 0)
func TestNearestWithinSpan(t *testing.T) {
if !Panics(func() { NearestWithinSpan(13, 7, 8.2, 10) }) {
t.Errorf("Did not panic below lower bound")
}
ind = NearestInSpan(13, 7, 8.2, 9)
if ind != 12 {
t.Errorf("Wrong value when above the upper bound. %i found, %i expected", ind, 12)
if !Panics(func() { NearestWithinSpan(13, 7, 8.2, 10) }) {
t.Errorf("Did not panic above upper bound")
}
ind = NearestInSpan(13, 7, 8.2, 7.19)
ind := NearestWithinSpan(13, 7, 8.2, 7.19)
if ind != 2 {
t.Errorf("Wrong value when just below the bucket. %i found, %i expected", ind, 2)
}
ind = NearestInSpan(13, 7, 8.2, 7.21)
ind = NearestWithinSpan(13, 7, 8.2, 7.21)
if ind != 2 {
t.Errorf("Wrong value when just above the bucket. %i found, %i expected", ind, 2)
}
ind = NearestInSpan(13, 7, 8.2, 7.2)
ind = NearestWithinSpan(13, 7, 8.2, 7.2)
if ind != 2 {
t.Errorf("Wrong value when equal to bucket. %i found, %i expected", ind, 2)
}
ind = NearestInSpan(13, 7, 8.2, 7.151)
ind = NearestWithinSpan(13, 7, 8.2, 7.151)
if ind != 2 {
t.Errorf("Wrong value when just above halfway point. %i found, %i expected", ind, 2)
}
ind = NearestInSpan(13, 7, 8.2, 7.249)
ind = NearestWithinSpan(13, 7, 8.2, 7.249)
if ind != 2 {
t.Errorf("Wrong value when just below halfway point. %i found, %i expected", ind, 2)
}