Questions tagged [units]
Questions about using, converting, or interpreting units of measurement in Mathematica.
309
questions
0
votes
1
answer
265
views
Solving Equations with units is not working
I have the code
Clear[distance, time, Vavg];
Solve[Quantity[Vavg, "Meters"/"Seconds"] ==
Quantity[distance, "Meters"]/Quantity[time, "Seconds"], distance]
...
- 383
8
votes
1
answer
8k
views
Convert radian to degree and add °
How can I convert a radian angle to a degree one and add ° after it?
I am using N[(Pi/4)/Degree], but the output is 45. with ...
- 545
1
vote
0
answers
95
views
How to get a conversion factor in new system of unit
There is some numerical relation $I = \frac{c}{8\pi} E^2$ between the wave intensity $I$ and the electric field strength $E$ written in CGS (centimetre, gram, second) system of units, where $c$ is ...
3
votes
1
answer
74
views
Why does the TimeObject seem to lose precision? (+ note on units)
According to the documentation (11.0.1.0)
Shorter lists can be used in TimeObject[{h,m,s}], which represents the time to whatever accuracy is specified: {h} is not [sic?*] treated as being ...
- 2,560
1
vote
0
answers
52
views
Why isn't this fully evaluating [closed]
I'm still new to mathematica which sometimes feels magical to me.
For example,
...
- 111
4
votes
1
answer
816
views
How do I generate a list of just the physical constants? [And other questions on them.]
N.B.: I've bolded the questions to make it easy to find them among the background verbiage.
1) Is there a way to generate a list of just the physical constants? [Note that I am not looking for a ...
- 3,643
1
vote
1
answer
106
views
Unit conversion in a function using another function as an argument
My problem is related to the previous post Passing a function as an argument to another function using the same variables. I don't understand why in the following example the conversion of units does ...
- 111
4
votes
1
answer
155
views
What are the UnitConvert units for ItemSize and FieldSize?
I have discovered the unit for ImageSize is "DesktopPublishingPoints" as setting
...
- 43.1k
0
votes
0
answers
209
views
Mathematica does not fully simplify units [duplicate]
I use the Quantity function in Mathematica to simplify and check units. Sometimes I cannot get Mathematica to simplify units. What I am doing wrong?
For example, find units of thermal diffusivity:
<...
- 437
4
votes
1
answer
284
views
Working with tables of equations in different units
I frequently work with tables of engineering equations in different units. I suppose physicists might do the same thing. For example, a table might look like this:
Some of the values are inputs and ...
- 4,102
0
votes
1
answer
177
views
How can I obtain a list of the physical quantities supported? [duplicate]
How can we list all available physical quantities in Mathematica?
- 830
4
votes
1
answer
362
views
Bug recognizing "Wavenumbers" as a unit of energy?
Wavenumbers, aka inverse centimeters, has dimensions of energy and thus should be easily convertible to joules. MMA clearly recognizes "Wavenumbers" at some level, since it autosuggests this unit when ...
- 3,643
12
votes
1
answer
138
views
Display bug in Dataset's UnitConvert handling
Bug introduced in 11.0.1 or earlier and fixed in 11.1.0
Is this yet another annoying regression in v11 Dataset type handling? The display form seems to be a ...
- 15.2k
9
votes
2
answers
1k
views
Physical (and other) constants
As Mathematica documentation likes to say, "As of Version 9.0, physical constant functionality is built into the Wolfram Language". After clicking on the ">>", one ...
- 4,006
0
votes
1
answer
80
views
Radians missing from NSolve result
Why does the result not include radians in the solution for a? This does not occur if I use meters instead of radians.
...
- 141
4
votes
1
answer
239
views
Plotting with units: emits error and gives incorrect plot
I've been trying to find some information on how to use Plot with a quantity that has units. I have a function, h[x_], that ...
- 143
4
votes
0
answers
70
views
QuantityForm does not work with MixedRadixQuantity?
Bug introduced after 9.0 and in 10.1 or earlier, and persisting through 11.2 or later
From 10.1 to 10.3.1, QuantityForm[q, "Abbreviation"] outputs
From 10.4 to 11....
- 43.1k
8
votes
1
answer
518
views
Working with degrees minutes and seconds without conversion
Is there a way to work with angles in DMS without converting them to decimal degrees, that is to sum them, subtract them?
I do not know how to even enter it without using string. My idea is something ...
- 4,006
5
votes
0
answers
83
views
Problem with specifying quantity value in FormulaData
I wanted to use the formulas for KineticEnergy and KineticEnergyRelativistic with specific quantity vaules. The later formula ...
- 1,332
31
votes
2
answers
4k
views
Unit Discovery: Is this some sort of a sick joke?
Alright, let's have some fun here. I am essentially following the documentation by Wolfram, just looking at different quantities.
...
- 4,159
1
vote
2
answers
234
views
7
votes
1
answer
202
views
AutomaticUnits package in Mma 11
I have really come to like this package, and, no, the built-in units handling in newer versions of Mma isn't a match for it by a long, long stretch. With some minor editing following the author's ...
- 4,159
1
vote
1
answer
1k
views
How to convert output time in terms of seconds to minute with UnitConvert[]? [duplicate]
I have this code:
AbsoluteTiming[g[x_, t_] := Sin[x]^90*(1 + t^2);
Integrate[g[x, \[Tau]], {\[Tau], 0, t}]]
with this output:
I want to have convert unit to ...
- 185
3
votes
1
answer
79
views
How to get Quantity to collect like terms?
In Mathematica numerical terms collect when their variables are equal.
.2 "SERC" + .7 "SERC"
(* 0.9 "SERC" *)
However, numerical ...
- 43.1k
6
votes
2
answers
484
views
Atom weight in SI units
In chemistry is very common to use the units grams/mol for the atomic weight, so the mass of one atom (of Tin, for example) is calculated as :
massOfOneAtom = (0.11871 (Kg/mol))/(AvogadroConstant (1/...
- 61
5
votes
1
answer
364
views
How to set UnitSystem permanently
I would like to set the system of units ($UnitSystem) permanently to "Metric".
I know that I can do
...
- 37k
0
votes
0
answers
51
views
Set default unit for information rate and others
I am using mathematica to convert units to canonical form, like I have 0.2 KBYTE/s and I want to get 200. So I want to see all '...
- 550
13
votes
1
answer
390
views
Is Quantity necessary?
Soft question: are Quantity - and newly added MixedUnit and MixedMagnitude - needed in a ...
- 15.2k
1
vote
2
answers
263
views
4
votes
0
answers
556
views
Custom units Compatible with Conversions [closed]
I am writing a Mathematica Palette to work with units, and am wondering if anyone knows a way to define new units outside of the standard ones that come with Mathematica 9. I do know of the ...
- 507
2
votes
2
answers
187
views
Simplifying expressions containing unit of zero magnitude
I have obtained the following form as a part of a computation:
k (Quantity[0, "Kilohertz"]) + Quantity[1/500, "Kilohertz"]
This is typeset as
Here, ...
- 125
8
votes
0
answers
345
views
Spectral Radiance unit Flicks is not correct
Bug introduced in version 10.3 or earlier and fixed in 11.1.
I was pleasantly surprised that Mathematica (10.3, 10.4, 10.4.1, 11.0 and 11.0.1) had the unit $\text{flick}$ until I spent several hours ...
- 1,402
4
votes
2
answers
186
views
How to override DisplayForm of (mixed) time Quantity
What's the best approach to overriding DisplayForm for specific types of Quantity eg time especially w/ mixed units?
Current is ...
- 15.2k
11
votes
4
answers
373
views
How to prevent Quantity calculations from converting units
I have an accrual calculation that I would like to preserve the units even though they are of the same dimension (e.g. time). For example, I would like the following
...
- 43.1k
3
votes
0
answers
152
views
How to insert a formula to FormulaData?
Unit Checking Demo
In order to throw a unit error,we run the code
...
- 366
2
votes
1
answer
155
views
How to correctly use FormulaData
I am exploring some of the functions involving units and formulas, and wondered how to input quantities if the variable has a subscript.
This works
...
- 3,780
5
votes
1
answer
252
views
Get Isotope Data and Electron Mass in Same Units - kg and Kilograms
I'm trying to find the nuclear mass of $^{238}\text{U}$. To do this, I subtract the electron mass from the atomic mass. I'd like to find the final answer in kilograms. I'd also like to use Mathematica'...
- 173
9
votes
1
answer
162
views
Why does the front-end no longer like MixedRadix as an argument for UnitConvert?
I often find MixedRadix very useful for make certain kinds of unit conversions. For example,
...
- 108k
7
votes
1
answer
241
views
DateListPlot failing on Inflation Adjusted TimeSeries
Bug introduced in 10.0 or earlier and solved in 10.4
Bug introduced in 10.0 or earlier and persisting through 11.0.1 or later
First bug. See output of ...
- 11k
10
votes
2
answers
1k
views
Why do I get QuantityUnits`Private`ToQuantity when trying to use units?
I'm unable to use units in mathematica (10.3.1) When I do
Quantity[500, "Feet"] + Quantity[50, "Meters"]
the answer I get is
...
- 435
4
votes
2
answers
432
views
What's wrong in "Watt"/("Centimeters")^2 [closed]
Why Mathematica returns the following input unevaluated?
...
- 789
3
votes
0
answers
284
views
Physical constants seems broken in 10.3
For example, if I just enter Quantity["GravitationalConstant"], then the result is this
...
- 7,931
2
votes
1
answer
443
views
Differential Equations and Unit Notation
What do I get the Syntax::sntxi: Incomplete expression; more input is needed . error when I try to use the math palette for derivatives?
What does the dot in ...
- 121
5
votes
1
answer
587
views
Plotting with units — getting the right axes labels
I have a simple example:
Plot[UnitConvert[Quantity[x, "DegreesCelsius"], "DegreesFahrenheit"], {x, -25, 300},
AxesLabel -> Automatic]
The x-axis has the ...
- 4,006
1
vote
0
answers
641
views
Convert large KML coordinate datasets to UTM [closed]
I was wondering if there are ways to convert massive amounts of KML coordinates into UTM coordinates using Mathematica. Other programs would also be acceptable. Thanks.
I have the KML file from ...
0
votes
1
answer
146
views
Electromagnetism units conversion in Mathematica 10 (possible bug)
Is this a bug in Mathematica 10? Why can't I convert Amps/m to Gauss?
...
0
votes
0
answers
48
views
A complete list of quantities in Mathematica 9/10? [duplicate]
Often times when I'm traveling I don't have internet access and cannot reliably use Wolfram Alpha for unit look-up. Additionally, Alpha can always choose to change how it interprets the units I enter, ...
- 6,167
1
vote
2
answers
193
views
3
votes
1
answer
158
views
Calculating consumed internet data from bitmap of chart
My internet connection has a speed drawn up by
the y axes has a scale as KB per second. and the x axes is time elapsed. if the x axes be from 0 to 40 minutes how can I calculate total consumed bytes ...
- 4,897
6
votes
0
answers
149
views
Calculations with "Quantities" Run Slow. What am I doing wrong?
This code plots a 1000 point black body radiation curve in 0.7 seconds.
...
- 61