Plot all the rain drops on the window when the time is 0 s (i.e. at the start of the journey) using a FOR loop. The plot should be contained exactly in the perimeter of the window and the rain drops should be represented as solid blue lines that conn

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R.D 2020-4-10

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回答： Vinai Datta Thatiparthi 2020-4-12

HOW CAN I SOLVE THE FOLLOWING?

Plot all the rain drops on the window when the time is 0 s (i.e. at the start of the journey) using a FOR loop. The plot should be contained exactly in the perimeter of the window and the rain drops should be represented as solid blue lines that connect the corresponding start and end nodes

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R.D 2020-4-10

A person is travelling in a rainy day from London to Cambridge on a direct train without intermediate stops. This person decides to take pictures of one of the windows of the train at intervals of 30 s. The window is a rectangle with a length of 2 m and a height of 1 m. In total, 62 pictures were taken in the 30.5-minutes journey. In each of them the coordinates of the start and the end points (points A and B, respectively) of the rain drops that hit the window were annotated with respect to the system of Cartesian axes represented in Figure 1. This data is included in the files available on Moodle:

XYpoints_timeFromDeparture_XXX.txt

where XXX represents the time from departure in which the picture of the window was taken, in seconds. You should download all these files from the Moodle assignment to your working directory before attempting to complete the exercise. Do not save these files in a different folder, your script should work with the data files stored in the same folder as the script (do not submit the data files, submit only the script, as explained previously). The format in each of these data files is the following:

Column 1: X coordinate of the start point A of the drop in the window, in m.

Column 2: Y coordinate of the start point A of the drop in the window, in m.

Column 3: X coordinate of the end point B of the drop in the window, in m.

Column 4: Y coordinate of the end point B of the drop in the window, in m.

Figure 1. Reference system of coordinates in the window of the train. It is known that in a fixed reference the velocity of the rain is ????? = 10 m/s and that it forms an angle ????? = 300 with respect to the vertical line. Consider that positive angles as counter clock-wise in this exercise. You should also assume that in each time instant the rain drops on the window are only those that appear in the corresponding text file, with the previous ones being completely removed from the window. Also assume that the train movement is completely horizontal in the negative-X direction of Figure 1.

You are asked to create a MATLAB M-file named “problem2_XXX.m” (exactly like this, without capital letters or spaces, and substituting XXX by your full student number)

Steven Lord 2020-4-10

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

R.D 2020-4-10

I check the site but I don't know how to start

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Answer 1

Vinai Datta Thatiparthi 2020-4-12

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在 MATLAB Online 中打开

Hello!

There are clearly a lot of moving pieces in this question, and it is unclear where exactly it is that you want help. However, at least from the title of the question, it seems like you want to read data from a given .txt file, load it into MATLAB and plot a line connecting the start and end coordinates, using a for loop.

Here it goes -

dataIn = readmatrix('filenameXYZ.txt'); % Read data from given .txt file
xA = dataIn(:,1); % X-Coordinates of A
yA = dataIn(:,2); % Y-Coordinates of A
xB = dataIn(:,3); % X-Coordinates of B
yB = dataIn(:,4); % Y-Coordinates of B
% Use for loop to iterate through all rows and plot data
for i=1:size(dataIn,1)
    % Plot line between A & B points using their coordinates
    plot([xA(i),xB(i)], [yA(i),yB(i)]); 
    % Plot on the same figure
    hold on  
end

Documentation Links:

readmatrix: Link
Matrix Operations & Indexing: Link
plot: Link

As mentioned by @Steven earlier, MATLAB Onramp courses are a great way to kickstart your journey with MATLAB.

Hope this helps!

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Plot all the rain drops on the window when the time is 0 s (i.e. at the start of the journey) using a FOR loop. The plot should be contained exactly in the perimeter of the window and the rain drops should be represented as solid blue lines that conn

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Plot all the rain drops on the window when the time is 0 s (i.e. at the start of the journey) using a FOR loop. The plot should be contained exactly in the perimeter of the window and the rain drops should be represented as solid blue lines that conn

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