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0

Nim language question here. I want to read a series of floats from stdin (this example: 7, 1, 4, 4, nan, 4) and store it in a seq[float] type. The input may contain NaNs. But I fail to integrate such outliers.

My code:

var
 line: TaintedString
 timeSeries: seq[float]

while readline(stdin, line) != false:
 echo timeSeries
 timeSeries.add(parseFloat(line))

The output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[nan, nan, nan, nan, nan, nan]

Facing the first NaN, Nim renders all inputs as NaNs. But I want this (last line of output):

@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

How do I solve it correctly in Nim? Documentation says NaNs are supported…

sequence nan nim

share|improve this question

asked Mar 22 at 22:33

smartmicsmartmic

333310

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What platform are you on and what back-end compiler are you using?
  
  – Anthon
  Mar 23 at 6:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am using nim 0.19.4 on Linux/i386, backend compiler is gcc and I have the same effect with -d:release switch. Sorry, I omitted the import statement in above snippet.
  
  – smartmic
  Mar 23 at 8:32
  
  

  
  
  
  

add a comment | 

0

Nim language question here. I want to read a series of floats from stdin (this example: 7, 1, 4, 4, nan, 4) and store it in a seq[float] type. The input may contain NaNs. But I fail to integrate such outliers.

My code:

var
 line: TaintedString
 timeSeries: seq[float]

while readline(stdin, line) != false:
 echo timeSeries
 timeSeries.add(parseFloat(line))

The output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[nan, nan, nan, nan, nan, nan]

Facing the first NaN, Nim renders all inputs as NaNs. But I want this (last line of output):

@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

How do I solve it correctly in Nim? Documentation says NaNs are supported…

sequence nan nim

share|improve this question

asked Mar 22 at 22:33

smartmicsmartmic

333310

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What platform are you on and what back-end compiler are you using?
  
  – Anthon
  Mar 23 at 6:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am using nim 0.19.4 on Linux/i386, backend compiler is gcc and I have the same effect with -d:release switch. Sorry, I omitted the import statement in above snippet.
  
  – smartmic
  Mar 23 at 8:32
  
  

  
  
  
  

add a comment | 

Nim language question here. I want to read a series of floats from stdin (this example: 7, 1, 4, 4, nan, 4) and store it in a seq[float] type. The input may contain NaNs. But I fail to integrate such outliers.

My code:

var
 line: TaintedString
 timeSeries: seq[float]

while readline(stdin, line) != false:
 echo timeSeries
 timeSeries.add(parseFloat(line))

The output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[nan, nan, nan, nan, nan, nan]

Facing the first NaN, Nim renders all inputs as NaNs. But I want this (last line of output):

@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

How do I solve it correctly in Nim? Documentation says NaNs are supported…

sequence nan nim

share|improve this question

asked Mar 22 at 22:33

smartmicsmartmic

333310

var
 line: TaintedString
 timeSeries: seq[float]

while readline(stdin, line) != false:
 echo timeSeries
 timeSeries.add(parseFloat(line))

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[nan, nan, nan, nan, nan, nan]

@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

share|improve this question

asked Mar 22 at 22:33

smartmicsmartmic

333310

share|improve this question

asked Mar 22 at 22:33

smartmicsmartmic

333310

asked Mar 22 at 22:33

smartmicsmartmic

333310

asked Mar 22 at 22:33

smartmicsmartmic

333310

1 Answer
1

active

oldest

votes

1

Since you echo timeSeries before you add the next number, the input of the last line with 4 causes the @[7.0, 1.0, 4.0, 4.0, nan] and it is guesswork what you did after that to get the final output line. Although I doubt there is a valid reason for anything to set every value in the sequence to NaN, it might be that what your input triggered a bug.

I have not been able to reproduce your output
with your code (adding the required import strutils) when entering your sequence followed by another 4, nan or empty line (the latter erroring on invalid float).

For easier testing, I put your input in a file input.txt:

7
1 
4
4
nan
4

and ran the following on the latest stable nim (Nim Compiler Version 0.19.4 [Linux: amd64]) as the latest devel nim (Nim Compiler Version 0.19.9 [Linux: amd64]):

import strutils

var
 line: TaintedString
 timeSeries: seq[float]

echo timeSeries
for line in "input.txt".lines:
 timeSeries.add(parseFloat(line.strip))
 echo timeSeries

(the .strip is only there to handle trailing spaces in the input that were a result of cut-and-paste and sloppy editing)

Both compilers output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

compiling with -d:release did not cause any errors either.

share|improve this answer

edited Apr 6 at 7:55

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I could reproduce your example, it works for me as well. I will investigate why it failed in my initial try (could not reproduce this quickly though)
  
  – smartmic
  Mar 23 at 8:49
  

  
  
  
  

add a comment | 

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1

Since you echo timeSeries before you add the next number, the input of the last line with 4 causes the @[7.0, 1.0, 4.0, 4.0, nan] and it is guesswork what you did after that to get the final output line. Although I doubt there is a valid reason for anything to set every value in the sequence to NaN, it might be that what your input triggered a bug.

I have not been able to reproduce your output
with your code (adding the required import strutils) when entering your sequence followed by another 4, nan or empty line (the latter erroring on invalid float).

For easier testing, I put your input in a file input.txt:

7
1 
4
4
nan
4

and ran the following on the latest stable nim (Nim Compiler Version 0.19.4 [Linux: amd64]) as the latest devel nim (Nim Compiler Version 0.19.9 [Linux: amd64]):

import strutils

var
 line: TaintedString
 timeSeries: seq[float]

echo timeSeries
for line in "input.txt".lines:
 timeSeries.add(parseFloat(line.strip))
 echo timeSeries

(the .strip is only there to handle trailing spaces in the input that were a result of cut-and-paste and sloppy editing)

Both compilers output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

compiling with -d:release did not cause any errors either.

share|improve this answer

edited Apr 6 at 7:55

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I could reproduce your example, it works for me as well. I will investigate why it failed in my initial try (could not reproduce this quickly though)
  
  – smartmic
  Mar 23 at 8:49
  

  
  
  
  

add a comment | 

1

Since you echo timeSeries before you add the next number, the input of the last line with 4 causes the @[7.0, 1.0, 4.0, 4.0, nan] and it is guesswork what you did after that to get the final output line. Although I doubt there is a valid reason for anything to set every value in the sequence to NaN, it might be that what your input triggered a bug.

I have not been able to reproduce your output
with your code (adding the required import strutils) when entering your sequence followed by another 4, nan or empty line (the latter erroring on invalid float).

For easier testing, I put your input in a file input.txt:

7
1 
4
4
nan
4

and ran the following on the latest stable nim (Nim Compiler Version 0.19.4 [Linux: amd64]) as the latest devel nim (Nim Compiler Version 0.19.9 [Linux: amd64]):

import strutils

var
 line: TaintedString
 timeSeries: seq[float]

echo timeSeries
for line in "input.txt".lines:
 timeSeries.add(parseFloat(line.strip))
 echo timeSeries

(the .strip is only there to handle trailing spaces in the input that were a result of cut-and-paste and sloppy editing)

Both compilers output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

compiling with -d:release did not cause any errors either.

share|improve this answer

edited Apr 6 at 7:55

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I could reproduce your example, it works for me as well. I will investigate why it failed in my initial try (could not reproduce this quickly though)
  
  – smartmic
  Mar 23 at 8:49
  

  
  
  
  

add a comment | 

Since you echo timeSeries before you add the next number, the input of the last line with 4 causes the @[7.0, 1.0, 4.0, 4.0, nan] and it is guesswork what you did after that to get the final output line. Although I doubt there is a valid reason for anything to set every value in the sequence to NaN, it might be that what your input triggered a bug.

I have not been able to reproduce your output
with your code (adding the required import strutils) when entering your sequence followed by another 4, nan or empty line (the latter erroring on invalid float).

For easier testing, I put your input in a file input.txt:

7
1 
4
4
nan
4

and ran the following on the latest stable nim (Nim Compiler Version 0.19.4 [Linux: amd64]) as the latest devel nim (Nim Compiler Version 0.19.9 [Linux: amd64]):

import strutils

var
 line: TaintedString
 timeSeries: seq[float]

echo timeSeries
for line in "input.txt".lines:
 timeSeries.add(parseFloat(line.strip))
 echo timeSeries

(the .strip is only there to handle trailing spaces in the input that were a result of cut-and-paste and sloppy editing)

Both compilers output:

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

compiling with -d:release did not cause any errors either.

share|improve this answer

edited Apr 6 at 7:55

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152

7
1 
4
4
nan
4

import strutils

var
 line: TaintedString
 timeSeries: seq[float]

echo timeSeries
for line in "input.txt".lines:
 timeSeries.add(parseFloat(line.strip))
 echo timeSeries

@[]
@[7.0]
@[7.0, 1.0]
@[7.0, 1.0, 4.0]
@[7.0, 1.0, 4.0, 4.0]
@[7.0, 1.0, 4.0, 4.0, nan]
@[7.0, 1.0, 4.0, 4.0, nan, 4.0]

share|improve this answer

edited Apr 6 at 7:55

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152

answered Mar 23 at 6:39

AnthonAnthon

33.1k1798152