There is no error message
that's maybe a bigger concern. how is it there are no error messages produced by Octave? What does your screen show after each line of input?
'load' expects a certain kind of data. Using D as an exponential delimiter as Dmitri said does not work with 'load'. if you used 'dynam = dlmread('dynam')', that line would work because dlmread is better at deciphering files with delimited text data.