regarding machine learning onramp

sir i am stuck at module 3.3 of machine learning onramp course at task 1.

please do help me to continue with the course.

Answer 1

[VISHAL]

letterds = datastore("*_M_*.txt");
data = read(letterds);
data = scale(data);
plot(data.X,data.Y)
axis equal
plot(data.Time,data.Y)
ylabel("Vertical position")
xlabel("Time")
function data = scale(data)
    data.Time = (data.Time - data.Time(1))/1000;
    data.X = 1.5*data.X;
end

[sarthak bagadi]

thanks bro!

Answer 2

[Logesh B]

preprocds = transform(letterds,@scale)

[Naethan Smith]

It keeps coming up with an error message when I enter that code into task 2, is there an alternative code?

[Tinghui]

I echo the same question. It keeps saying " does the variable preprocds exist?"

[구룽]

same here.

[Shraddha Gandham]

same here

[Jose]

same here. Has someone managed to overcome this message?

[Image Analyst]

See https://www.mathworks.com/matlabcentral/answers/682853-machine-learning-onramp-module-3-3-task-3?s_tid=answers_rc1-3_p3_Topic

What is the link for the on-ramp course. If I call it up can I jump to that question or do I have to do all the prior tasks before getting to that?