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python numpy std vs scala breeze stddev
2019 Community Moderator ElectionScala: What is the generic way to calculate standard deviationCalling an external command in PythonWhat are metaclasses in Python?Finding the index of an item given a list containing it in PythonDifference between append vs. extend list methods in PythonHow can I safely create a nested directory in Python?Does Python have a ternary conditional operator?How to get the current time in PythonHow can I make a time delay in Python?How to make a flat list out of list of lists?Does Python have a string 'contains' substring method?
I'm currently working on migrating some python code to scala. I'm using breeze lib as a substitution for numpy.
Everything looks fine, but I faced different behaviour in output of standard deviation implementations:
Python:
series = np.array([1,4,5])
np.mean(series) // 3.3333333333333335
np.std(series) // 1.699673171197595
Scala:
val vector = breeze.linalg.Vector[Double](Array(1.0, 4.0, 5.0))
val mean = breeze.stats.mean(vector) // 3.3333333333333335
val std = breeze.stats.stddev(vector) // 2.081665999466133
I know how to reproduce python's behaviour in plain scala. Sample code is presented here: Scala: What is the generic way to calculate standard deviation
But I'm looking for a way to get it with breeze. Any ideas?
python scala scala-breeze
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
asked Oct 17 '18 at 13:24
NormalNormal
5461423
add a comment |
I'm currently working on migrating some python code to scala. I'm using breeze lib as a substitution for numpy.
Everything looks fine, but I faced different behaviour in output of standard deviation implementations:
Python:
series = np.array([1,4,5])
np.mean(series) // 3.3333333333333335
np.std(series) // 1.699673171197595
Scala:
val vector = breeze.linalg.Vector[Double](Array(1.0, 4.0, 5.0))
val mean = breeze.stats.mean(vector) // 3.3333333333333335
val std = breeze.stats.stddev(vector) // 2.081665999466133
I know how to reproduce python's behaviour in plain scala. Sample code is presented here: Scala: What is the generic way to calculate standard deviation
But I'm looking for a way to get it with breeze. Any ideas?
python scala scala-breeze
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
asked Oct 17 '18 at 13:24
NormalNormal
5461423
add a comment |
I'm currently working on migrating some python code to scala. I'm using breeze lib as a substitution for numpy.
Everything looks fine, but I faced different behaviour in output of standard deviation implementations:
Python:
series = np.array([1,4,5])
np.mean(series) // 3.3333333333333335
np.std(series) // 1.699673171197595
Scala:
val vector = breeze.linalg.Vector[Double](Array(1.0, 4.0, 5.0))
val mean = breeze.stats.mean(vector) // 3.3333333333333335
val std = breeze.stats.stddev(vector) // 2.081665999466133
I know how to reproduce python's behaviour in plain scala. Sample code is presented here: Scala: What is the generic way to calculate standard deviation
But I'm looking for a way to get it with breeze. Any ideas?
python scala scala-breeze
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
asked Oct 17 '18 at 13:24
NormalNormal
5461423
I'm currently working on migrating some python code to scala. I'm using breeze lib as a substitution for numpy.
Everything looks fine, but I faced different behaviour in output of standard deviation implementations:
Python:
series = np.array([1,4,5])
np.mean(series) // 3.3333333333333335
np.std(series) // 1.699673171197595
Scala:
val vector = breeze.linalg.Vector[Double](Array(1.0, 4.0, 5.0))
val mean = breeze.stats.mean(vector) // 3.3333333333333335
val std = breeze.stats.stddev(vector) // 2.081665999466133
I know how to reproduce python's behaviour in plain scala. Sample code is presented here: Scala: What is the generic way to calculate standard deviation
But I'm looking for a way to get it with breeze. Any ideas?
python scala scala-breeze
python scala scala-breeze
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
asked Oct 17 '18 at 13:24
NormalNormal
5461423
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
asked Oct 17 '18 at 13:24
NormalNormal
5461423
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
edited Oct 17 '18 at 13:46
martineau
68.8k1091185
68.8k1091185
asked Oct 17 '18 at 13:24
NormalNormal
5461423
asked Oct 17 '18 at 13:24
NormalNormal
5461423
asked Oct 17 '18 at 13:24
NormalNormal
5461423
5461423
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
This is related to the number of degrees of freedom. Indeed,
>>> np.std(series, ddof=1)
2.081665999466133
Which is the sample std. With breeze, something you can do to get the population std is
var n = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
1
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
add a comment |
If keepAlive's solution don't work, you should change "n" to Double
var n : Double = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is related to the number of degrees of freedom. Indeed,
>>> np.std(series, ddof=1)
2.081665999466133
Which is the sample std. With breeze, something you can do to get the population std is
var n = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
1
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
add a comment |
This is related to the number of degrees of freedom. Indeed,
>>> np.std(series, ddof=1)
2.081665999466133
Which is the sample std. With breeze, something you can do to get the population std is
var n = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
1
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
add a comment |
This is related to the number of degrees of freedom. Indeed,
>>> np.std(series, ddof=1)
2.081665999466133
Which is the sample std. With breeze, something you can do to get the population std is
var n = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
This is related to the number of degrees of freedom. Indeed,
>>> np.std(series, ddof=1)
2.081665999466133
Which is the sample std. With breeze, something you can do to get the population std is
var n = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
edited Oct 17 '18 at 13:45
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
answered Oct 17 '18 at 13:30
keepAlivekeepAlive
3,18541224
3,18541224
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
1
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
add a comment |
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
1
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
Thanks for explanation. I've found related issue in breeze GitHub page: github.com/scalanlp/breeze/issues/507
– Normal
Oct 17 '18 at 13:40
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
@Normal This may be something you know but see my update regarding how to deal with this issue.
– keepAlive
Oct 17 '18 at 14:01
1
1
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
works for me, thanks!
– Normal
Oct 17 '18 at 14:26
add a comment |
If keepAlive's solution don't work, you should change "n" to Double
var n : Double = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
add a comment |
If keepAlive's solution don't work, you should change "n" to Double
var n : Double = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
add a comment |
If keepAlive's solution don't work, you should change "n" to Double
var n : Double = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
If keepAlive's solution don't work, you should change "n" to Double
var n : Double = 3
val std = breeze.stats.stddev(vector)*Math.pow((n-1)/n, .5)
# 1.6996731711975948
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
answered 2 days ago
Pablo López GallegoPablo López Gallego
1
1
add a comment |
add a comment |
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