In the Simple Units environment, any verifications of valid dimensions ignore so-called Unit annotations.

In the Simple Units environment, the arguments for the logarithmic functions must be unit-free, and so is the result. If you would like the results to have a unit in the dimension of logarithmic gain, consider using the Standard Units environment.

Every command in the Simple Units environment that needs to determine whether an expression is valid or not, does so using the Units:-TestDimensions command.

For other properties, see the global function ln.

To enter a unit in 2-D Math input, select the unit from the appropriate Units palette. If the unit you want is not there, select $\mathrm{unit}$ and then enter the unit.

When you edit a unit, double brackets appear around it.

$\mathrm{with}\left(\mathrm{Units}\left[\mathrm{Simple}\right]\right)\:$

$\ln \left(5.3\mathrm{Unit}\left(m\right)\right)$

Error, (in Units:-Simple:-ln) the following expressions imply incompatible dimensions: {ln(5.3*Units:-Unit(m))}

$\mathrm{val}≔\ln \left(a\mathrm{Unit}\left(m\right)\right)$

$\mathrm{val}≔\ln \left(a⟦m⟧\right)$

$\mathrm{eval}\left(\mathrm{val}\,a=7.5\mathrm{Unit}\left(\mathrm{diopter}\right)\right)$

$2.014903021$

$\mathrm{eval}\left(\mathrm{val}\,a=5.3\right)$

Error, (in Units:-Simple:-eval) the following expressions imply incompatible dimensions: {ln(5.3*Units:-Unit(m))}

The Units[Simple][log2] command was introduced in Maple 2021.

For more information on Maple 2021 changes, see Updates in Maple 2021.