Can detectImportOptions automatically return the fixedWidthImportOptions?

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Jingying Tian
Jingying Tian 2019-4-3
评论： Stephen23 2025-11-26
I have many text data to be imported in MATLAB.
But when I use T = readtable(filename,opts) and opts = detectImportOptionsdetectImportOptions(filename), the opts always return a DelimitedTextImportOptions, while what I needed is fixedWidthImportOptions.
Is there any method to return fixedWidthImportOptions by the function detectImportOptions before each text data be readed.
I cannot specify the format of fixedWidthImportOptions since every text data has different variable width.
  2 个评论
Sharannya Ranjith
Sharannya Ranjith 2019-4-10
There are two ways of generating a 'fixedWidthImportOptions': through the generic constructor (which would require to manually populate the options), or through 'detectImportOptions'. There is no way to force 'detectImportOptions' to return the fixedWidthImportOptions'. You may want to generate IO functions via the import tool if you need to restrict the mannerism.
https://www.mathworks.com/help/matlab/ref/matlab.io.text.fixedwidthimportoptions.html#bvmdw9z-2
Stephen23
Stephen23 2025-11-26
"Is there any method to return fixedWidthImportOptions by the function detectImportOptions before each text data be readed."
Yes: specify the FileType option as 'fixedwidth': https://www.mathworks.com/help/matlab/ref/detectimportoptions.html#namevaluepairs

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