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15 years, 351 days

My role is to help customers better exploit our tools. I’ve worked in selling, supporting and marketing maths and simulation software for all my professional career.

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I was born, raised and spent my formative years in England’s second city, Birmingham. I graduated with a degree in Chemical Engineering from The University of Nottingham, and after completing a PhD in Fluid Dynamics at Herriot-Watt University in Edinburgh, I started working for Adept Scientific – Maplesoft’s partner in the UK.

## Select the text you want to format, and ...

Select the text you want to format, and then go to Format > Character > Subscript or Format > Character > Superscript

## The ThermophysicalData:-Property subpack...

The ThermophysicalData:-Property subpackage is built on top of an open source library called CoolProp. CoolProp natively use SI units, and returns temperatures in K.

For this call…

ThermophysicalData:-Property(T, "IF97::Water", Q = 0.100, P = 1*Unit(psi))

…Maple receives an absolute temperature of 311.9 K from CoolProp.

If the unit system is set to FPS via Units:-UseSystem(FPS), this is converted to 561.1 F (= 311.1 * 9/5), assuming that 311.9K is a temperature difference.

This assumption is incorrect in context, but this context is not known to Units:-UseSystem(). The correct temperature conversion would be (311.9K − 273.15) × 9/5 + 32 = 101.7F

Rather than changing the default unit system to FPS, you could consider

• Keeping the default unit system to SI

• Changing the units of individual results manually to FPS

• via the Context Panel

• except for absolute temperatures, in which use use convert(temperature_in_kelvin,temperature,degF) instead

## Maple Flow doesn't (yet) support for...

Maple Flow doesn't yet support

• for loops in the canvas (you can, however, enter procedures with for loops in the coding window)
• print statements in the canvas

## Section 6.3 of the User Manual (Help >...

Section 6.3 of the User Manual (Help > User Manual) states:

To create a multi-line header or footer, use a newline character.
• On Windows, use \n
• On Mac, use \r

The manual also offers an example:

## Here's a couple of methods you could...

Here's a couple of methods you could try:

## Two approaches...

The conversion that's closest in spirit to the Mathcad worksheet is this:

But this isn't necessarily the best way to implement this type of calculation in Maple Flow. Here's another approach that you might consider a better use of Maple Flow's functionality:

## When resizing an image with the mouse, h...

When resizing an image with the mouse, hold down the Shift key to maintain the aspect ratio.

## This is on the roadmap, but not in the p...

This is on the roadmap, but not in the product just yet

## You can use the Context Panel to rescale...

You can use the Context Panel to rescale Ω to kΩ.

## In "Enter Units", write `Omega...

In "Enter Units", write `Omega` for ohms, or `kOmega` for kilo ohms.

## You can generate compressibility factor ...

You can generate compressibility factor charts with the ThermophysicalData package

```with(ThermophysicalData):
fluid := "CH4":
Zc := (p, t) -> Property(Z, fluid, temperature = t, pressure = p):
temps := [200*Unit(K), 300*Unit(K), 600*Unit(K)]:
plots:-display(
seq(plot(Zc(p, temps[i]), p = 0 * Unit(bar)..600 * Unit(bar)),i = 1..3)
,seq(plots:-textplot([640, Zc(600*Unit(bar), temps[i]), temps[i]] ), i = 1..3)
,labels = ["Pressure (bar)", "Compressibility Factor"]
,labeldirections = [horizontal, vertical]
)```

## You can certainly rescale kg/(m^2*s^2) t...

You can certainly rescale kg/(m^2*s^2) to N/m^3 using the Context Panel. You need to use the "Enter Unit" field to specify your custom unit:

## You can convert to torque units (e.g. N*...

You can convert to torque units (e.g. N*m, lbf*ft etc) with the Context Panel.

• Click on the result you want to rescale to torque (this probably has units of energy e.g. J) and open the Context Panel

• Locate the "Enter Unit" box in the Context Panel, and enter your desired units of torque (e.g. N*m)

• Press Enter

You should now find that your result is rescaled to units of torque

## The Optimization package understands uni...

The Optimization package understands units, so you could do something like this:

 > restart: XU:=Vector([1*Unit(s), 2*Unit(s), 3*Unit(s), 4*Unit(s), 5*Unit(s), 6*Unit(s)]): YU:=Vector( [2*Unit(m), 3*Unit(m), 4*Unit(m), 3.5*Unit(m), 5.8*Unit(m), 7*Unit(m)]): sse:=(a,b,c)->add( (a+b*XU[i]+c*XU[i]^2 - YU[i])^2, i = 1..6): Optimization:-Minimize(sse(a,b,c),initialpoint = {a=1*Unit(m),b=1*Unit(m/s), c=1*Unit(m/s^2)})
 (1)
 >

Add this option to the plot command: `useunits=[deg,lbf]`