incorrect reading of a txt file

I have this .txt file that I have to read in Matlab. The first line is text and the second line onwards are numbers.

Using 'importdata' I do not get the desired result. How come?

Answer 1

[Dyuman Joshi]

I am not sure what the expected output is supposed to be, but you can use readtable -

in = readtable('test.txt','DecimalSeparator',',')

Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.

in = 3×9 table
    numberDef       A         B          C       D      E          F        GAr       F_1  
    _________    _______    ______    _______    _    ______    _______    ______    ______

        5        -0.3935    0.3958    -0.0089    0    0.0135    -0.0017    0.0645    0.0645
       12        -0.1664    0.2135    -0.0008    0    0.0002    -0.0001    0.0256    0.0256
       15        -0.2771    0.2765    -0.0096    0    0.0035    -0.0009    0.0491    0.0491