Index in position 2 exceeds array bounds (must not exceed 2)

The assignment;;;

Section 3: Write a command to load data_set2.txt, and define time as column 1, and EMG data for muscle X as column 2, muscle Y as column 3 and muscle Z as column 4. Create the following variables:

o rate that defines the rate of capture (2000 Hz)

o timeinterval computed based on the rate of capture per second

o num as the length of samples collected

o totaltime as a function of num and timeinterval variables

o time starting at timeinterval and using timeinterval as the fixed interval between

samples to totaltime

Can someone help me out and indicate what I did was wrong...

[Guillaume]

Hard to tell without the full text of the error message or the input file. I suspect that your data_set2.txt file has only two columns (or at least only two columns have been imported into matlab) so of course, trying to access the 3rd column doesn't work.

[Vanessa Arp]

Ok that makes sense....

the assignment said i need to create four columns so how do i do that if the file has only two columns?

the professors sent me this--

This is good, but you have to understand what you are doing in these few lines:

MuscleX = data_set2(:,2); %put Muscle X data into array

MuscleY = data_set2(:,3); %put Muscle Y data into array

MuscleZ = data_set2(:,4); %put Muscle Z data into array

You determined which variable was which column. Muscle X Y and Z

Then you try to do the following:

rate = 2000;

timeinterval = 1/rate;

num = length (EMG);

Not sure what was i suppose to do in these few lines?

[Image Analyst]

What does this show:

whos data_set2

[Vanessa Arp]

my professors'

[Guillaume]

"the assignment said i need to create four columns so how do i do that if the file has only two columns"

As I said, "hard to say without seeing the input file". Since you can't magic data out of thin air, I'd say get a file with 4 columns.

[Vanessa Arp]

I got this error

Error using abs

Too many input arguments.

Error in ArpAssignment3 (line 95)

RecifiedEMG1 = abs(HighPassFilterEMG1,2);

Do you know why I did wrong?

[Guillaume]

As the error tells you, you passed too many inputs to abs. abs only works with one input. I've no idea what the 2 in your call is meant to do.