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[最佳答案] table elements where meant for scientific data, such as probes from experiments, not for actual layout: Tables should not be used purely as a means to layout document content as this may present problems when rendering to non-visual media. Additionally, when used with graphics, these tables may force users to scroll horizontally to view a table designed on a system with a larger display. To minimize these problems, authors should use style sheets to control layout rather than tables. While you'

[最佳答案] There is no built-in MATLAB function to do what you want. You could use a try-catch block: >> try a = month(0); catch a = nan; end >> a a = NaN However, the best option would probably be to error-check the index first, throwing an error or setting a variable to a default value if it is out of range. If you really want to try using an index that may be 0, you could write your own get_def function. Here's one way to do it: function value = get_def(vector,index,defaultValue) try value