# $$\text{IsNaN}$$¶

You can use the $$\text{IsNaN}$$ function to determine if a real value is NaN or ‘not a number’.

You can use the \isnan backslash command to insert this function.

The following variants of this function are available:

• $$\text{boolean } \text{IsNaN} \left ( \text{<value>} \right )$$

Functions and operators will result in NaN under the following circumstances:

• Cases where the operator or function’s value is undefined. Example would be the result of $$\frac{0}{0}$$.

• Cases where a function is not defined for the value of one or more supplied parameters.

• Certain error conditions.

Figure 158 shows the basic use of the $$\text{IsNaN}$$ function.

Figure 158 Example Use Of The IsNaN Function