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Mathematica seems confused about Kilograms vs KilogramsForce
Implementing CGS unit system in Mathematica 9Unit issues in Mathematica 9Can't force UnitConvert to be evaluated in PlotHow to dequantify units in mathematica?Where to see all Mathematica unitsIntegrate complains about incompatible quantities in integration limitsPhysical constants seems broken in 10.3How to prevent Quantity calculations from converting unitsMathematica does not fully simplify unitsHow do I properly use Quantities (units) in plots?
$begingroup$
This does what I expect:
Quantity["Kilograms"*"Meters"] // InputForm
Quantity[1, "Kilograms"*"Meters"]
This, on the other hand, bungles the units:
Quantity[1, "Kilograms*Meters"] // InputForm
Quantity[1, "KilogramsForce"*"Meters"]
Note that KilogramsForce is a unit of force, not mass, and strictly different from Kilograms. This is not a case of a subtle and understandable misinterpretation as in the case of Kelvins vs KelvinsDifference, but a parsing error.
- What do we need to be careful about when writing down units for parsing? How can we prevent parsing errors, other than splitting the units as in the first input line above?
- Are there other cases like this one?
- Is this a residue of Imperial Units parsing, where pounds and pounds-force are sometimes used interchangeably?
- Is this the result of an overly greedy way of interpreting a torque? This parsing error seems specific to the $text{kg}cdottext{m}$ unit and does not occur, e.g., with $text{kg}cdottext{s}$.
units
asked 7 hours ago
RomanRoman
1,581614
$endgroup$
add a comment |
$begingroup$
This does what I expect:
Quantity["Kilograms"*"Meters"] // InputForm
Quantity[1, "Kilograms"*"Meters"]
This, on the other hand, bungles the units:
Quantity[1, "Kilograms*Meters"] // InputForm
Quantity[1, "KilogramsForce"*"Meters"]
Note that KilogramsForce is a unit of force, not mass, and strictly different from Kilograms. This is not a case of a subtle and understandable misinterpretation as in the case of Kelvins vs KelvinsDifference, but a parsing error.
- What do we need to be careful about when writing down units for parsing? How can we prevent parsing errors, other than splitting the units as in the first input line above?
- Are there other cases like this one?
- Is this a residue of Imperial Units parsing, where pounds and pounds-force are sometimes used interchangeably?
- Is this the result of an overly greedy way of interpreting a torque? This parsing error seems specific to the $text{kg}cdottext{m}$ unit and does not occur, e.g., with $text{kg}cdottext{s}$.
units
asked 7 hours ago
RomanRoman
1,581614
$endgroup$
2
$begingroup$
AndQuantity[1, "Kilograms*Meters^2"] // InputFormis interpreted correctly
$endgroup$
– Gustavo Delfino
6 hours ago
add a comment |
$begingroup$
This does what I expect:
Quantity["Kilograms"*"Meters"] // InputForm
Quantity[1, "Kilograms"*"Meters"]
This, on the other hand, bungles the units:
Quantity[1, "Kilograms*Meters"] // InputForm
Quantity[1, "KilogramsForce"*"Meters"]
Note that KilogramsForce is a unit of force, not mass, and strictly different from Kilograms. This is not a case of a subtle and understandable misinterpretation as in the case of Kelvins vs KelvinsDifference, but a parsing error.
- What do we need to be careful about when writing down units for parsing? How can we prevent parsing errors, other than splitting the units as in the first input line above?
- Are there other cases like this one?
- Is this a residue of Imperial Units parsing, where pounds and pounds-force are sometimes used interchangeably?
- Is this the result of an overly greedy way of interpreting a torque? This parsing error seems specific to the $text{kg}cdottext{m}$ unit and does not occur, e.g., with $text{kg}cdottext{s}$.
units
asked 7 hours ago
RomanRoman
1,581614
$endgroup$
This does what I expect:
Quantity["Kilograms"*"Meters"] // InputForm
Quantity[1, "Kilograms"*"Meters"]
This, on the other hand, bungles the units:
Quantity[1, "Kilograms*Meters"] // InputForm
Quantity[1, "KilogramsForce"*"Meters"]
Note that KilogramsForce is a unit of force, not mass, and strictly different from Kilograms. This is not a case of a subtle and understandable misinterpretation as in the case of Kelvins vs KelvinsDifference, but a parsing error.
- What do we need to be careful about when writing down units for parsing? How can we prevent parsing errors, other than splitting the units as in the first input line above?
- Are there other cases like this one?
- Is this a residue of Imperial Units parsing, where pounds and pounds-force are sometimes used interchangeably?
- Is this the result of an overly greedy way of interpreting a torque? This parsing error seems specific to the $text{kg}cdottext{m}$ unit and does not occur, e.g., with $text{kg}cdottext{s}$.
units
units
asked 7 hours ago
RomanRoman
1,581614
asked 7 hours ago
RomanRoman
1,581614
edited 7 hours ago
Roman
asked 7 hours ago
RomanRoman
1,581614
asked 7 hours ago
RomanRoman
1,581614
asked 7 hours ago
RomanRoman
1,581614
1,581614
2
$begingroup$
AndQuantity[1, "Kilograms*Meters^2"] // InputFormis interpreted correctly
$endgroup$
– Gustavo Delfino
6 hours ago
add a comment |
2
$begingroup$
AndQuantity[1, "Kilograms*Meters^2"] // InputFormis interpreted correctly
$endgroup$
– Gustavo Delfino
6 hours ago
2
2
$begingroup$
And
Quantity[1, "Kilograms*Meters^2"] // InputForm is interpreted correctly$endgroup$
– Gustavo Delfino
6 hours ago
$begingroup$
And
Quantity[1, "Kilograms*Meters^2"] // InputForm is interpreted correctly$endgroup$
– Gustavo Delfino
6 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
Under the hood, units not recognized by Quantity use Wolfram|Alpha's NLP to parse the unit.
In this case we see there are 2 possibilities:
It's probably worth leaving feedback at the bottom of the Alpha page making your case that 'kilogram meters' should be the default for this query.
I don't think there's a way to access all possibilities in Quantity and I think the best way to avoid this is to use the canonical form of the units from the beginning.
If that's not feasible, as a workaround you can stringify your entire input and use Interpreter:
Interpreter["Quantity", AmbiguityFunction -> All]["1 Kilograms*Meters"]
AmbiguityList[
{Quantity[1, "KilogramsForce" "Meters"], Quantity[1, "Kilograms" "Meters"]},
"Kilograms*Meters",
{<|"Description" -> "kilogram-force meters"|>, <|"Description" -> "kilogram meters"|>}]
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
$endgroup$
1
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
1
$begingroup$
Considering how wide theInterpretercasts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly,Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"]gives four possible interpretations, and evenInterpreter["Quantity", AmbiguityFunction -> All]["1 Meter"]finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).
$endgroup$
– Roman
5 hours ago
add a comment |
Your Answer
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Under the hood, units not recognized by Quantity use Wolfram|Alpha's NLP to parse the unit.
In this case we see there are 2 possibilities:
It's probably worth leaving feedback at the bottom of the Alpha page making your case that 'kilogram meters' should be the default for this query.
I don't think there's a way to access all possibilities in Quantity and I think the best way to avoid this is to use the canonical form of the units from the beginning.
If that's not feasible, as a workaround you can stringify your entire input and use Interpreter:
Interpreter["Quantity", AmbiguityFunction -> All]["1 Kilograms*Meters"]
AmbiguityList[
{Quantity[1, "KilogramsForce" "Meters"], Quantity[1, "Kilograms" "Meters"]},
"Kilograms*Meters",
{<|"Description" -> "kilogram-force meters"|>, <|"Description" -> "kilogram meters"|>}]
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
$endgroup$
1
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
1
$begingroup$
Considering how wide theInterpretercasts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly,Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"]gives four possible interpretations, and evenInterpreter["Quantity", AmbiguityFunction -> All]["1 Meter"]finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).
$endgroup$
– Roman
5 hours ago
add a comment |
$begingroup$
Under the hood, units not recognized by Quantity use Wolfram|Alpha's NLP to parse the unit.
In this case we see there are 2 possibilities:
It's probably worth leaving feedback at the bottom of the Alpha page making your case that 'kilogram meters' should be the default for this query.
I don't think there's a way to access all possibilities in Quantity and I think the best way to avoid this is to use the canonical form of the units from the beginning.
If that's not feasible, as a workaround you can stringify your entire input and use Interpreter:
Interpreter["Quantity", AmbiguityFunction -> All]["1 Kilograms*Meters"]
AmbiguityList[
{Quantity[1, "KilogramsForce" "Meters"], Quantity[1, "Kilograms" "Meters"]},
"Kilograms*Meters",
{<|"Description" -> "kilogram-force meters"|>, <|"Description" -> "kilogram meters"|>}]
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
$endgroup$
1
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
1
$begingroup$
Considering how wide theInterpretercasts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly,Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"]gives four possible interpretations, and evenInterpreter["Quantity", AmbiguityFunction -> All]["1 Meter"]finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).
$endgroup$
– Roman
5 hours ago
add a comment |
$begingroup$
Under the hood, units not recognized by Quantity use Wolfram|Alpha's NLP to parse the unit.
In this case we see there are 2 possibilities:
It's probably worth leaving feedback at the bottom of the Alpha page making your case that 'kilogram meters' should be the default for this query.
I don't think there's a way to access all possibilities in Quantity and I think the best way to avoid this is to use the canonical form of the units from the beginning.
If that's not feasible, as a workaround you can stringify your entire input and use Interpreter:
Interpreter["Quantity", AmbiguityFunction -> All]["1 Kilograms*Meters"]
AmbiguityList[
{Quantity[1, "KilogramsForce" "Meters"], Quantity[1, "Kilograms" "Meters"]},
"Kilograms*Meters",
{<|"Description" -> "kilogram-force meters"|>, <|"Description" -> "kilogram meters"|>}]
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
$endgroup$
Under the hood, units not recognized by Quantity use Wolfram|Alpha's NLP to parse the unit.
In this case we see there are 2 possibilities:
It's probably worth leaving feedback at the bottom of the Alpha page making your case that 'kilogram meters' should be the default for this query.
I don't think there's a way to access all possibilities in Quantity and I think the best way to avoid this is to use the canonical form of the units from the beginning.
If that's not feasible, as a workaround you can stringify your entire input and use Interpreter:
Interpreter["Quantity", AmbiguityFunction -> All]["1 Kilograms*Meters"]
AmbiguityList[
{Quantity[1, "KilogramsForce" "Meters"], Quantity[1, "Kilograms" "Meters"]},
"Kilograms*Meters",
{<|"Description" -> "kilogram-force meters"|>, <|"Description" -> "kilogram meters"|>}]
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
edited 2 hours ago
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
answered 6 hours ago
Chip HurstChip Hurst
21.5k15790
21.5k15790
1
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
1
$begingroup$
Considering how wide theInterpretercasts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly,Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"]gives four possible interpretations, and evenInterpreter["Quantity", AmbiguityFunction -> All]["1 Meter"]finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).
$endgroup$
– Roman
5 hours ago
add a comment |
1
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
1
$begingroup$
Considering how wide theInterpretercasts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly,Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"]gives four possible interpretations, and evenInterpreter["Quantity", AmbiguityFunction -> All]["1 Meter"]finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).
$endgroup$
– Roman
5 hours ago
1
1
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
$begingroup$
Ha that's full-on en.wikipedia.org/wiki/Robopsychology ! Thanks @ChipHurst, this is at least a partial answer.
$endgroup$
– Roman
5 hours ago
1
1
$begingroup$
Considering how wide the
Interpreter casts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly, Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"] gives four possible interpretations, and even Interpreter["Quantity", AmbiguityFunction -> All]["1 Meter"] finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).$endgroup$
– Roman
5 hours ago
$begingroup$
Considering how wide the
Interpreter casts its net, its full reply is of limited use for an automated procedure and I cannot do better than pick its most likely answer (other than checking the ambiguity list manually). Surprisingly, Interpreter["Quantity", AmbiguityFunction -> All]["1 Second"] gives four possible interpretations, and even Interpreter["Quantity", AmbiguityFunction -> All]["1 Meter"] finds two ways of interpreting, even though these units are about as basic as it gets. NLP is not the right tool here, as it fails in unexpected ways (hence my reference to robopsychology).$endgroup$
– Roman
5 hours ago
add a comment |
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$begingroup$
And
Quantity[1, "Kilograms*Meters^2"] // InputFormis interpreted correctly$endgroup$
– Gustavo Delfino
6 hours ago