In the Simple Units environment, the diff function differentiates an expression a with respect to a name x that can have a unit.  The result is the derivative of a with respect to x; its unit is the unit of a divided by the unit of x.

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 diff.

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.

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

$-3.532x^2\mathrm{Unit}\left('J'\right)$

$-3.532x^2⟦J⟧$

$\mathrm{diff}\left(\,x\mathrm{Unit}\left('s'\right)\right)$

$-7.064x⟦W⟧$

$32x^2\mathrm{Unit}\left('\mathrm{ft}'\right)+7x\mathrm{Unit}\left('\mathrm{inch}'\right)+45\mathrm{Unit}\left('m'\right)$

$\left(\frac{6096}{625}{x}^2+\frac{889}{5000}x+45\right)⟦m⟧$

$\mathrm{diff}\left(\,x\mathrm{Unit}\left('s'\right)\,x\mathrm{Unit}\left('s'\right)\right)$

$\frac{12192}{625}⟦\frac{m}{s^2}⟧$

$4x^4-3x+2$

$4x^4-3x+2$

$\mathrm{diff}\left(\,x\mathrm{Unit}\left('s'\right)\right)$

$\left(16x^3-3\right)⟦\frac{1}{s}⟧$