Questions tagged [units]

Questions about using, converting, or interpreting units of measurement in Mathematica.

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29 views

How can I create a PasteButton that changes its “contents” dynamically?

I'm trying to make a units palette to help with my various engineering courses. I thought about creating a "meta-palette" of sorts, maybe one that changes on the fly, or one where I can ...
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1answer
40 views

UnitSimplify for unit multiples and submultiples

Is there any way to automatically rewrite units so that they display more naturally looking magnitudes? By this I mean that ...
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1answer
81 views

Plotting with hbar Griffiths 2nd edition quantum mechanics problem 10.1

I'm trying to plot the evolution of Psi from Problem 10.1 in Griffiths 2nd edition quantum mechanics. However, I'm having difficulty plotting because of the hbar in both numerator and denominator (so ...
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2answers
74 views

More Issues With Units

I have asked a couple questions here (and received terrific answers), and used that info. I am trying to fulfill a request from a colleague that liked the results of Astronomy info I had done, but ...
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1answer
43 views

Expression unexpectedly not evaluating to a numerical value [closed]

When I calculate the below, I get an unexpected output, not giving me the density, but rather a value M * .. ...
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0answers
48 views

Unit scaling: Human readable Quantity units

Consider some calculation yielding Quantity[x,"B"] as output ("B" interpreted as byte). Is there a way to automatically convert this to the ...
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1answer
42 views

Units Question for PlanetData[..]

I asked a similar question yesterday, which was answered splendidly, but I missed adding a detail. Attached is a command, its output, and the issue I have now. This outputs g/cm^3, but I'd rather have ...
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2answers
71 views

Converting Units [duplicate]

I'm using MMA 12.2. Trying to put together some astronomy pages, but the output of the command below is in miles. I would rather have it in SI units instead. On my system evaluating ...
2
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1answer
47 views

Getting error Solve::units [closed]

I'm trying to solve the following formula for i, given values for all other variables. There are two equations, the first one is a formula to show the transit ...
4
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2answers
141 views

AngularDegrees^2 and Steradians are incompatible units

UnitConvert[Quantity[360, "Degrees^2"], "Steradians"] AngularDegrees^2 and Steradians are incompatible units What am I doing wrong in not ...
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2answers
279 views

Why are Quantity and Units inconsistent with regular Mathematica behavior?

When I enter this in Wolfram Mathematica V12: 0 Dogs + 5 Cats Mathematica sensibly returns this: 5 Cats BUT, if I using the ...
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2answers
109 views

Planck's Law 3D Plot with units outputting blank graph

I'm trying to plot Planck's Law for black body radiation on a wavelength-temperature graph where the output (z-axis) is the intensity. The function has multiple variables so I tried Plot3D. https://en....
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4answers
289 views

Converting an equation with units to one without units

I may have a solution but it is not slick! See below Doing numerical calculations with functions that use units can be very slow. I would like to have a function or operator that can turn my functions ...
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0answers
54 views

How to get Integrate to determine units

In a similar fashion to the question asked here, I am having trouble trying to get Integrate to correctly determine the units of the integrand: Here I have plugged in specific values into the general ...
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0answers
67 views

Is there a reason why “Revolutions” and “Radians” or “AngularDegrees” are not CompatibleUnitQ?

I understand that keeping a consistent unit framework across multiple domains is complicated and not everyone will be satisfied with the choices made, like when people ask why "Radians" are ...
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0answers
38 views

How to stop Quantity from evaluating

I'm trying to get an expression to display, without it evaluating it's internal arguments, but for some reason, when given the Quantity function, HoldForm doesn't seem to do what I expect: Code ...
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0answers
63 views

How can I get Mathematica to display PSI instead of lbf/in^2 as a unit? [closed]

I'm new to Mathematica and I've been trying to figure out if there was a way for Mathematica to display psi instead of its standard output, "lbf/in^2."
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1answer
91 views

How do I make a general solver for a system of equations (e.g. thermodynamic processes) with different inputs and outputs?

Background Let's say I have a system of equations (e.g. thermodynamics equations), where the "knowns" and "unknowns" are subject to change, and the system of equations can also ...
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0answers
22 views

Issue displaying units with Quantity[] inside bar legend

Quantity[] is displaying some inconsistent behaviour when used in BarLegend[]. Compare the following two examples: ...
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1answer
54 views

Issues arising when using UnitSimplify for getting a dimensionless expression

I am having some difficulties when using UnitSimplify in manipulating expressions for obtaining dimensionless quantities in Mathematica 12.0.0. Here is a minimal ...
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0answers
30 views

Plotting a quantity-based function doesn't work

Creating the function: ...
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0answers
39 views

How to deal with units while plot?

I am plotting a bistable plot and the given code is giving me the bistable plot. But there is one problem in the plot. In the x-axis "P0" is multiplied with 10^(3) p. second. and in the y-axis, the ...
3
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2answers
69 views

Comparison of tagged units

Consider this data set: BNikkei = {{10.0032, 27 Days}, {10.0527, 22 Days}, {10.1283, 18 Days}} from a recent question, "More effective way to apply a function ...
4
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0answers
55 views

Force Solve to respect unit system

I give Solve quantities in FPS and it returns resulting quantities in SI, necessitating that I add an entire section to my workflow where I pick apart the solution ...
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0answers
69 views

UnitConvert having trouble multiplying Boltzmann's Constant with Fahrenheit?

T:=70 Quantity["DegreesFahrenheit"] kb:=Quantity["BoltzmannConstant"] UnitConvert[kb UnitConvert[T, "Kelvins"], "Electronvolts"] // N Returns 0.0253575 eV while <...
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0answers
84 views

Why aren't radians dimensionless?

α = Quantity[-3, ("Radians")/("Seconds")^2]; ω = Quantity[-4, ("Radians")/("Seconds")]; r = Quantity[2, "Feet"]; at = α r an = ω^2 r a = Sqrt[an^2 + at^2] ...
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0answers
32 views

Computing matrix eigenvalues with units

I apologize if this is a basic question or if I am not giving enough detail. I'm trying to solve for the eigenvalues of a matrix with matrix elements that have units. ...
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1answer
130 views

Using physics constant in calculation

I know that mathematica knows physical constants https://reference.wolfram.com/language/guide/Units.html If I write down = PlanckConstant it "recognizes" hbar. My question is: how can I use in an ...
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0answers
23 views

What is the reason StandardDeviation doesn't cooperate with Quantity “Percent”?

Consider the following list of numbers y = {13, 0.2, 11.201}; Turning y into a list of ...
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0answers
64 views

How to handle Units when Integrating?

I have some functions defined, which are to use units. Now another function is used to integrate over those, with the integration variable also quantified and the input to said function. I better just ...
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0answers
61 views

Does AroundReplace work with Quantity?

When I try to use AroundReplace with units it issues Around::compat message and outputs something strange: ...
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0answers
63 views

UnitSimplify rules?

Code as following: ...
4
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1answer
38 views

GeoDistance and Excel export

I'm trying to export the distance matrix below to an excel file. I have no interested on the unit. I just care the value of a distance. A standard export command does not work properly. How should I ...
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0answers
40 views

Any progress on Plots of Quantities?

Plots of quantities still don't seem to work. I've implemented the one suggestion people have: use Evaluate, but now the values of my plots are just completely off ...
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1answer
118 views

How to plot $ \sin\theta $ in degree? [closed]

Please suggest how to plot $ \sin\theta $ in degree. I am trying using the given below code but it is not working (It works if used Ticks without ...
4
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1answer
104 views

How to add some bytes quantity?

I have some strings like: st={"29M", "53K", "27K", "5.0M", "29M", "4.0K", "4.0M", "114M", "20K", "1.3G"} They are some bytes quantity, could we add or sort them ...
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0answers
40 views

Mathematica not simplifying expressions with units

Hi I'm having an issue with the Quantity system. On the guide for units on the wolfram page, there is an example ...
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3answers
425 views

Why is Mathematica messing with the time units in this simple equation? [closed]

If you lets say work 40 hours every week and your working days total to 251/5 weeks for a particular year. Then why is Mathematica messing this calculation and producing incorrect result? ...
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0answers
47 views

Is there a way to include holiday calendar into Quantity system?

Suppose I have a long list of business hours but in different denominations for postings like as follows. If I just use the vanilla UnitConvert it just does a ...
7
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2answers
231 views

Getting useful units for combinations of physical constants like on WolframAlpha?

When I need to do order of magnitude estimates, I often encounter situations where I have a mess of physical constants and difficulty putting them in sensible units. For example, consider the ...
3
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2answers
70 views

Extract values from strings according to units

I have a lot of strings, which have simple nomenclature of number-unit associations and am looking to extract the number according to the units. For example: ...
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1answer
51 views

Force UnitConvert to display the proper unit prefix and return inexact quantities? [closed]

I'm experimenting with units: UnitConvert[1/Quantity[2.0, "GHz"]] 5.*10^-10s ...
2
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3answers
71 views

Changing Y-Axis to “Billions of Dollars”

Is there a way to change my bar chart's Y-axis from powers of 10 to "billions of dollars"? For example $100,000,000,000 should read as ...
5
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2answers
99 views

Unitless quantities

There are many cases in science where a quantity should end up unitless. Yet the units capabilities of Mathematica seem to have a problem with such situations. For example: ...
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0answers
37 views

What is used for the % symbol in mathematica? [duplicate]

Im new in mathematica i want to know logic about this program. I got this code: {{vo, vn, Ii}} = {vo, vn, Ii} /. %; i know that the syntax /. is for replacement but i dont know whats going on with ...
6
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2answers
1k views

How to get Planck length in meters to 6 decimal places

I want Mathematica to format quantities to more decimal places than the default. For example I have tried ...
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0answers
56 views

Manipulating a ParametricFunction to handle units

I have a pretty nice way to handle units on a result from NDSolve, which basically consists of converting all of the units to SI, stripping them, calling NDSolve, and then putting the units back. I'll ...
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1answer
44 views

TargetUnits aren't working as expected on an InterpolatingFunction

Short version: My understanding of the use of TargetUnits in a Plot statement is that if the function being plotted has units, MMA will attempt to convert the output of that function to the unit form ...
6
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1answer
165 views

Very slow rendering of Quantity

I noticed since Mathematica v12 a very slow frontend when rendering the Units. Easy to show: Quantity[Range[1, 100], "Euros"] Takes (timed with a stopwatch) ...
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0answers
40 views

SemanticImport changes “string” type to “quantity” type--how to change during import or after import?

This question may overlap with other questions about the quirks of SemanticImport, but I don't see this specific wrinkle on StackExchange and I hope it will be a simple answer to help me and others ...

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