what mistake I am making?

I am trying to rectify emg signal from the given text file.

%%
% Fatigue Data
impFatigueA = importdata('Fatigue_A.txt');
impFatigueK = importdata('Fatigue_K.txt');
impFatigueZ = importdata('Fatigue_Z.txt');

 %% Rectifcication of the Signal 
 
 impFatigueA3 = abs(impFatigueA);
 impFatigueK3 = abs(impFatigueK);
 impFatigueZ3 = abs(impFatigueZ);

errror i am getting

>> untitled
Check for incorrect argument data type or missing argument in call to function 'abs'.

Error in untitled (line 36)
 impFatigueA3 = abs(impFatigueA);

Answer 1

[Mathieu NOE]

hello

I simply tested the first data set

when you do : impFatigueA = importdata('Fatigue_A.txt');

impFatigueA is a structure (containers)

to access the numerical data you have to dive a bit deeper

data1 = impFatigueA.data;

then you can take the abs of your data - I don't know yet which of the 16 columns you want to take the abs of it