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NABARUN MAIKAP
NABARUN MAIKAP on 11 May 2020
Commented: Kalagatla on 25 Jan 2024
This question was flagged by Walter Roberson
Hello all, I am new in this community .I need help to solve the below problem. please help me..
statement : You can add a custom function at the end of your script. For data preprocessing, the function should take the data returned from the datastore as input. It should return the transformed data as output.
function dataout = functionName(datain)
% do something with datain
dataout = ...
end
Given script :
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")
Task ; -
Create a function called scale at the end of the script that performs the following operations:
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
Because these commands modify the variable data directly, your function should use data as both the input and output variable.
Note that the third line of the script calls the scale function. Your script won't run until this function has been created.
Also note that local functions must be at the end of a script. This means you will be editing the script sections out of order in this interaction. The section headings show which section of the script to edit in each task.

Answers (10)

VISHAL
VISHAL on 30 May 2020
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

Ravi kumar
Ravi kumar on 13 May 2020
letterds = datastore("*_M_*.txt");
data = read(letterds);
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
plot(data.X,data.Y)
axis equal
plot(data.Time,data.Y)
ylabel("Vertical position")
xlabel("Time")
data = scale(data);
  1 Comment
DGM
DGM on 25 Apr 2023
Contrary to the instructions, this code performs all the tasks of the scale() function inline. Despite obviating the function call (and implementing no function), the nonexistent scale() function is still called, and it's called in a place where it would accomplish nothing even if it worked.
What's the point in posting answers that are demonstrably wrong?

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Hessel
Hessel on 1 Jun 2020
you should put the "sacle" function at the end
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")
preprocds = transform(letterds,@scale)
function data = scale(data)
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
end

Ali Al-nuaimi
Ali Al-nuaimi on 12 Jun 2020
preprocds = transform(letterds,@scale)
function data = scale(data)
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
end
  2 Comments
Prayas
Prayas on 15 Sep 2022
answer is wrong sir please solve it

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L.J.
L.J. on 13 Jun 2020
data = readall(preprocds);
plot(data.Time, data.Y)
The first line of code needs to be surpressed, so just be sure to add a ; to solve the issue :) good luck
  2 Comments
구룽
구룽 on 2 Oct 2022
task 2 says it's incorrect :(

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Abdul Aziz Hisham Shubbak
Abdul Aziz Hisham Shubbak on 19 Apr 2021
last all ::
function data = scale(data)
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
data.X = data.X - mean(data.X);
data.Y = data.Y - mean(data.Y);
end

Rhonnel S. Paculanan
Rhonnel S. Paculanan on 8 Jun 2022
Moved: DGM on 25 Apr 2023
TASK 1
function data = scale(data)
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
end
TASK 2
preprocds =transform( letterds , @scale ) % directly process the data storage
% Read all processed data
data =readall( preprocds );
plot( data . Time , data . Y )
TASK 3
preprocds = transform(letterds,@scale)
data = readall(preprocds)
plot(data.Time,data.Y)
TASK 4 (erase the content of Tasks 1 and paste this program)
function data = scale(data)
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
data.X = data.X - mean(data.X);
data.Y = data.Y - mean(data.Y);
end
TASK 5 (erase the content of Tasks 4 and paste this program)
function data = scale(data)
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
data.X = data.X - mean(data.X,"omitnan");
data.Y = data.Y - mean(data.Y,"omitnan");
end

Md. Hasnat Karim
Md. Hasnat Karim on 15 Feb 2023
put the scale function at the end of the script below the title "Tasks 1, 4, 5 ".
function data=scale(data)
data.Time=(data.Time-data.Time(1))/1000;
data.X = 1.5*data.X;
end
and write the following code for task 2
preprocds = transform(letterds,@scale)

Srivikasheetha
Srivikasheetha on 19 Jul 2023
Edited: Walter Roberson on 26 Aug 2023
letterds = datastore("*_M_*.txt");
data = read(letterds);
% Your existing code
plot(data.X, data.Y)
axis equal
plot(data.Time, data.Y)
ylabel("Vertical position")
xlabel("Time")
% Define the custom function 'scale'
function dataout = scale(datain)
% Perform the operations on the input datain
datain.Time = (datain.Time - datain.Time(1)) / 1000;
datain.X = 1.5 * datain.X;
% Assign the transformed datain to dataout
dataout = datain;
end
% Call the scale function and assign the output to 'scaled_data'
scaled_data = scale(data);

RAMAKANT
RAMAKANT on 24 Aug 2023
TASK
Create a function called scale at the end of the script that performs these operations:
data.Time = (data.Time - data.Time(1))/1000;
data.X = 1.5*data.X;
Because these commands modify the variable data directly, your function must use data as both the input and output variable.
Note that the third line of the script calls the scale function. Your script won't run until this function has been created.
Also note that local functions must be at the end of a script. This means you must edit the script sections out of order in this activity. The section headings in the script show which section of the script to edit in each task.
what is answer given task
  1 Comment
DGM
DGM on 24 Aug 2023
Your question is already answered above.
The course itself will also give you hints and solutions if you click on the links.

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