# Function: istableformat

## CALL:

## DESCRIPTION:

istableformat - check if S can be considered as a table structure CALL [ok,N,emsg]=istable(S) INPUT S: (candidate) table structure OUTPUT ok : true if S is table structure; false otherwise N : height of table emsg: <string> extra information if ok is false TABLE DEFINITION (added by ZIJPP 2001225) A table structure is a structure that meets the following conventions. - A table structure is a single structure with 0, 1 or more columns - If a table contains more than 1 column, all columns must be equal height - A column may be one ofd the following - a numeric or char array, including: - empty arrays ([0xW numeric or char]) - vectors of NILL elements ([Hx0 numeric or char]) - The preferred way to initialize an empty table structure is: T=struct ==> T= 1x1 struct array with no fields - By convention an empty scalar array or an empty struct array may be used to initialize an empty table structure: T=[] or T = struct([]) KNOWN ISSUES tableselect removes fieldnames if all rows of a table are removed EXAMPLE if ~istable(S) error('Assertion failed: variable is not a table structure'); end