Can detectImportOptions automatically return the fixedWidthImportOptions?

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.

[Sharannya Ranjith]

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]

"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