Use only the first 100 entries (the first 2 classes)

I have this homework assignment, I asked for help but I am a bit embarassed that I still don't know what to do.

I am loading 'fisheris'. I know how to parition the dataset into 60% training partition and 40% test partition

but it says to use only the first 100 etnries (the first 2 classes) for the remianing part of the assignment.

1. species (1:100)
2. meas (1:100,:)

If anybody can break down what this mean and how to approach this I would really appreciate it.

I know this must be a tall ask.

[Geoff Hayes]

G - what are the dimensions of species and meas (presumably these are from the data file, fisheris...)? If you are only supposed to use the first 100 rows (your entries), then you would extract just those rows using

speciesSubset = species(1:100, :);
measSubset = meas(1:100, :);

We use 1:100 to indicate that we want the first one hundred rows, and the : to indicate that we want all of the columns.

[Geoff Hayes]

G's answer moved here

I am super new to matlab but yes, it is the standard fisheries in matlab data set. I have no idea if it would work because meas and species would be different sizes.

After I input what you suggested, this is what it shows.

[Geoff Hayes]

You say that I have no idea if it would work because meas and species would be different sizes. But isn't that still true if you use all of the entries/rows? How would you solve this problem if you use all of the data? Why should using all or a subset of the data be different?

[G. Nardi]

Partitioning the data set. I think I have it done correctly but not sure.

commandwindow; 
load ('fisheriris');


training = (1:60);
test = (61:100); 

speciesSubset = species(1:100, :);
measSubset = meas(1:100, :);