I need a reciprocal under math function block.

After selecting the math function block in plecs library, there is no function for reciprocal.

The functions under the math function are square,square root,exponential, logarithm,power,mod,rem.

Please what can I use to represent a reciprocal?

You can use a “Divide” block or a “Function” block from the Functions & Tables section of the PLECS library with the 1/u expression.

Be careful not to divide by zero by either sanitizing the input or using the min/max functions in your expression.