Representing data from File !

Question

Susan 2011-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/12753-representing-data-from-file

Hello Guys, I have a data in a file consists of two columns one for the arrival time and the other one for the Energy(ev).. I want to represent the data in the x-axes region so I will be able to estimate its function using kernel density function.. I am not sure how to represent the data in the x-axes though? I did once represent the data in the x-axes like a little dashes way and I used(repmat)but with this case I don't have any idea how to do so.. In this link there is an image and if you look at the x-axes you will see some dashes that are more in some area and less in another, thats exactly what I am looking for so I will be able to estimate its function later on..

http://upload.wikimedia.org/wikipedia/commons/2/2a/Kernel_density.svg

Also, in my previously asked question you can see if you run it what I mean by "little dashes on the x-axes(red data))

Thank you all,

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Susan 2011-7-31

http://www.mathworks.com/matlabcentral/answers/4596-plot-spikes-in-matlab

If you run it you should be able to see what I mean"by the dashes in the x-axes" also, the link I put is for an image that could show you what I am expecting"only look in the dashes in the x-axes in the image"

Walter Roberson 2011-7-31

duplicate is at http://www.mathworks.com/matlabcentral/answers/12733-plot-data-from-file

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Answer 1

Fangjun Jiang 2011-7-31

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在 MATLAB Online 中打开

Go back to your previous post. I saw similar dash in the figure. The answer is right there. The command to draw it is line().

Sa=0:0.2:2; %if your original data is column vector, transpose it.
line(repmat(Sa,2,1),repmat([0;1],1,length(Sa)),'color','r' );
axis([0 2 0 10]);

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Jan 2011-7-31

@Susan: This is one of the questions which you have to answer by your own. It definitely depend, on what you want to be displayed. If you want to show the values from 1.4 to 37.2, you use these limits. If you want to display all value from the file, you have to get the min and max of the values from the file.

Susan, I have the impression that you are working in a level of high confusion. An exhaustive analysis of your problems will help you to formulate better questions, such that the answer will be short and matching. Analysis means, that you split the problem into smaller parts as far as possible, that to find the minimal set of inputs for each sub-problem and the exact definition of the output. If all small sub-problems are solved exactly, the whole problem is solved.

The distinction between needed and not needed details is essential for programming. E.g. the color is not needed to simulate car dynamics, so do not waste time for handling the color in the problem descritpion. The meaning of a variable is not needed for the sub-problem of drawing a diagram - Matlab draws _numbers_ only. Of course for the complete problem the meaning of the numbers gets important again, but do not let such details confuse you (and the readers of you questions) in the sub-problem level.

Fangjun Jiang 2011-7-31

@Susan, you need to go back to the basics of MATLAB or programming in general. The line() command draws a line from one point to another point. In this example, it draws from (0,0) to (0,1), from (1,0) to (1,1), from (2,0) to (2,1) etc. The height is all 1. If you want to change the height, you can change the number accordingly. If you can't understand and see this, you need to go back to the basics.

Susan 2011-7-31

Oh no, I get that and I understood it awhile ago.. Thanks !

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Answer 2

Jan 2011-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/12753-representing-data-from-file#answer_17435

Do you want to represent the Energy or the arrival time in the X-axis? The small dashs at the bottom of the shown image represent just a binary signal versus time, e.g. the arrival times of detected signals. Therefore it is not clear, how you want the two data sets to be represented in a diagram. The small dashs with equal size simply do not match to your data.