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4-Participant

## How to write mathematical equations in relation dialog box, such as cuberoot, cot, tan, cosine etc??

Hi All,

Let take is a parameter(d1), ds,g1 and toe...
now i want to write equation for below farmulaes, how can i write, please suggest...

regards & thanks!
Shravan

1 ACCEPTED SOLUTION

Accepted Solutions
21-Topaz I
(To:RoyCrerar)

Gotta put that 1/3 in parentheses. Operator precedence.

27^1/3 = ( 27 ^ 1 ) / 3 = 27 / 3 = 9

27^(1/3) = 27^0.33333333 = 3

8 REPLIES 8
23-Emerald II
(To:srajbhar)

It should all be explained in the help section under expressions.

I am not sure about the cuberoot value.

23-Emerald IV
(To:srajbhar)
21-Topaz I
(To:srajbhar)

R1max = 0.505 * d1 + 0.069*d1^(1/3)

ds = p * cos ( tau / 2 ) / sin ( tau / 2 ) - 1.04 * g1 - 0.76

The only term I'm not sure of is the fractional "power", "^(1/3). I've never had need to use such an expression. You should also take a look at the reference materials people have suggested. The syntax is similar to most programming languages with respect to operator precedence, etc.

All "variables" above ( such as "tau", "d1", "R1max", etc.) are assumed to have been defined as parameters or model dimensions.

4-Participant
(To:KenFarley)

It worked! thanks!

16-Pearl
(To:srajbhar)

This sounds like an excellent case for using an embedded Mathcad worksheet instead of Relations.

Mathcad Express is free from PTC, and no additional licenses are necessary to embed a worksheet. This functionality is available from the Applications tab.

Dave Martin - dmartin@creowindchill.com - https://www.mcaeconsulting.com
10-Marble
(To:srajbhar)

Unless I'm mistaken, these equations are of fundamental importance in the urine extraction process.
Or as we call it in Scotland, taking the piss!

??

14-Alexandrite
(To:srajbhar)

Hi, for power and root functions the format is ^x and ^-x, so cube root will be ^0.333 or ^1/3

21-Topaz I
(To:RoyCrerar)

Gotta put that 1/3 in parentheses. Operator precedence.

27^1/3 = ( 27 ^ 1 ) / 3 = 27 / 3 = 9

27^(1/3) = 27^0.33333333 = 3

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