ECG, difference between original data and imported data of original data into Matlab

Hi I need some help in importing data from Physionet into Matlab.

For instance,

the data I copied into excel are the following:

Time(s) |Volt(s)
0.00000  8.46
0.00004  8.592
0.00008  8.352
0.00012  8.152
0.00016  8.34

hence in Excel, the data is presented in 2 columns, 6 rows. When I type in importdata Excelfile.xlsx into Matlab (Excelfile refers to the file containing the above information), the following data then appears,

Trial>> importdata 'Book2.xlsx'

ans =

         0    8.4600
    0.0000    8.5920
    0.0001    8.3520
    0.0001    8.1520
    0.0002    8.3400
    0.0002    8.5280
    0.0002    8.3120

how come there is a difference between that of column 1 in the original data and that of the imported data in Matlab?

Please help me anyone. I've been figuring this out for days, nearing to a week.

My email is as follows: [e-mail]

Answer 1

[Thorsten]

The default format do display numbers in Matlab is short, i.e., "Scaled fixed point format with 5 digits.". If you want to see more digits (15 for double), use

format long

So your numbers are read correctly, they are just displayed by default with too few digits.