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"unit syntax error"

Posted Nov 2, 2010, 5:35 p.m. EDT 2 Replies

Xiaoyi Yu
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In "Global Definitions --- Parameters", the value of Volume (V) is known, I input "(3*V/(4*pi))^(1/3)" to calculate the Radius (R) of the Sphere, but an error happens, i.e. "unit syntax error". Why? Cannot use "^(1/3)" in comsol?
2 Replies Last Post Nov 3, 2010, 9:55 a.m. EDT
Magnus Ringh COMSOL Employee

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Posted: 1 decade ago Nov 3, 2010, 5:09 a.m. EDT
Hi,

This works in version 4.0a, so I assume that you are using version 4.0.
The unit syntax in COMSOL Multiphysics treats units with integer exponents. Fractional exponents like 1/3 do work, however, if the "composite exponents" for the unit in the expression are integers (in this case, m^(3/3) = m).

Best regards,
Magnus Ringh, COMSOL
Hi, This works in version 4.0a, so I assume that you are using version 4.0. The unit syntax in COMSOL Multiphysics treats units with integer exponents. Fractional exponents like 1/3 do work, however, if the "composite exponents" for the unit in the expression are integers (in this case, m^(3/3) = m). Best regards, Magnus Ringh, COMSOL
Xiaoyi Yu
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Posted: 1 decade ago Nov 3, 2010, 9:55 a.m. EDT

Hi,

This works in version 4.0a, so I assume that you are using version 4.0.
The unit syntax in COMSOL Multiphysics treats units with integer exponents. Fractional exponents like 1/3 do work, however, if the "composite exponents" for the unit in the expression are integers (in this case, m^(3/3) = m).

Best regards,
Magnus Ringh, COMSOL


Thanks!
Yes, I use version4.0. So we cannot use "^(1/3)", i.e. the fractional expoent, in version 4.0, right?
[QUOTE] Hi, This works in version 4.0a, so I assume that you are using version 4.0. The unit syntax in COMSOL Multiphysics treats units with integer exponents. Fractional exponents like 1/3 do work, however, if the "composite exponents" for the unit in the expression are integers (in this case, m^(3/3) = m). Best regards, Magnus Ringh, COMSOL [/QUOTE] Thanks! Yes, I use version4.0. So we cannot use "^(1/3)", i.e. the fractional expoent, in version 4.0, right?

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