Changes

<div style="font-size:30px">'''ISSTRING(n)'''</div><br/>

<div style="font-size:30px">'''ISSTRING (thing)'''</div><br/>

*<math>n</math> is the value to test.

*<math>thing</math> is the value to test.

 

 

==Description==

==Description==

*This function is  one of the group in ISFUNCTIONS.

*This function is  one of the group in ISFUNCTIONS.