Undefined function or variable 'fixedWidt​hImportOpt​ions'.

2019 2 23
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更新时间：2019 2 24
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I get the following error message whenever I try to use the object 'fixedWidthImportOptions':
" Undefined function or variable 'fixedWidthImportOptions'. "
I am using Matlab R2018a. The object was introduced with R2017a. What is wrong and what can I do to remedy this?

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回答（1 个）

Star Strider
Star Strider 2019-2-23

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It’s an options structure to be used with the readtable (link) function. See the documentation section on Examples (link).
How are you using it?

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Rod Letchford
Rod Letchford 2019-2-23
Star Strider: I am trying to use it to read data from a text file with sections in fixed column width, and mixed data (double and strings) as in another question of mine. I've tried readtable, textscan and others I can't remember. It is strangely complicated.
Rod Letchford
Rod Letchford 2019-2-24
It looks like I was using the wrong syntax for FixedWidthImportOptions. I was using this syntax:
opts = fixedWidthImportOptions('NumVariables',NumVariables,...
'DataLines',DataStartLine,...
'VariableNames',VariableNames,...
'VariableWidths',VariableWidths,...
'VariableTypes',DataType);
for readtable, where I should have used something like:
opts = matlab.io.text.FixedWidthImportOptions;
opts.DataLines = DataStartLine;
opts.VariableNames = VariableNames;
opts.VariableWidths = VariableWidths;
opts = setvartype(opts,DataType);
It is far from clear that this is the case nor why.

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