Plot this kind of graph from data of an array

Question

Good afternoon,

I am working on a Matlab project and I have stored some data in an array. I would like to plot a plot like the plot shown below. However, I don't know what plotting function I need to use and how, in order to obtain the image plot (it will be not the same, but this style).

My data is on a 11x16 - matrix.

Thank you guys so much beforehand!

enter image description here

@rayryeng

It was a really useful answer, although I didn't need that exact shape. I need the shape that my data would create, I've been trying to modify the code you wrote in order to obtain what I need but I did not obtained it...

My data is

data = ( 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 ; 
8.00 8.02 8.04 8.07 8.12 8.20 8.30 8.42 8.53 8.63 8.72 8.80 8.86 8.91 8.96 9.00;
6.00 6.03 6.07 6.12 6.22 6.37 6.59 6.83 7.07 7.28 7.45 7.60 7.72 7.83 7.92 8.00;
4.00 4.03 4.07 4.14 4.26 4.48 4.85 5.26 5.63 5.95 6.21 6.43 6.61 6.75 6.88 7.00;
2.00 2.02 2.05 2.10 2.20 2.44 3.08 3.70 4.23 4.67 5.01 5.29 5.52 5.70 5.86 6.00;
0 0 0 0 0 0 1.33 2.24 2.93 3.47 3.88 4.21 4.46 4.67 4.84 5.00;
0 0 0 0 0 0 0 1.01 1.78 2.38 2.84 3.19 3.46 3.67 3.84 4.00;
0 0 0 0 0 0 0 0 0.80 1.43 1.91 2.25 2.51 2.70 2.86 3.00;
0 0 0 0 0 0 0 0 0 0.63 1.10 1.41 1.62 1.77 1.89 2.00;
0 0 0 0 0 0 0 0 0 0 0.44 0.66 0.79 0.88 0.94 1.00;
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0)

This is my matrix of data (sorry I know it's too long), well and when I try to plot writing:

[x,y] = meshgrid(1:16,1:11);
contourf(x,y,data,20,'LineStyle','none');
colorbar

It should have a different shape than what I get. I need to get that the part that are 0 (zeros) are like the white part of the plot I showed before. (Different shape though) I don't really know how to do it (my data should be read properly), if you could help me I would be really thankful.

Thank you so much for last answer.

check stackoverflow.com/questions/11765025/… stackoverflow.com/questions/13015070/… — Beisi Xu
– Beisi Xu, Commented Nov 21, 2014 at 17:00
Where's the data? Can you attach it with your post? Try using imagesc which will plot your data and apply a colour map to it... but I can't say for sure since you don't have your data here. mathworks.com/help/matlab/ref/imagesc.html — rayryeng
– rayryeng, Commented Nov 21, 2014 at 17:24

Rash · Accepted Answer · 2014-11-21 20:55:42Z

2

It depends on your data, I believe you should use contourf.

This is as close as I could get,

[x,y] = meshgrid(1:16,1:11);
data = - y;
data(end,5:10) = NaN;
data(end-1,6:9) = NaN;
data(end-2,7:8) = NaN;
contourf(x,y,data,20,'LineStyle','none');
colorbar

enter image description here

with,

data = - y .* abs(log(sin(.10 * x - 5.5)+.5));
data(data < -4) = NaN;

enter image description here

So I suppose the code is right, it's matter of your data,

with data = max(data(:)) - data;

enter image description here

edited Nov 21, 2014 at 20:55

answered Nov 21, 2014 at 17:39

Rash

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1 Comment

user3780731 Over a year ago

Wow thank you so much! I would like you to read the next answer by me (since it's not going to fit here all the text I'm going to write)

rayryeng · Accepted Answer · 2014-11-21 20:54:29Z

1

What you have is almost correct. All you need to do is set any data that is 0 to NaN. That way, when you throw it into contourf, those parts are not visualized. As such:

data = [10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 ;
8.00 8.02 8.04 8.07 8.12 8.20 8.30 8.42 8.53 8.63 8.72 8.80 8.86 8.91 8.96 9.00;
6.00 6.03 6.07 6.12 6.22 6.37 6.59 6.83 7.07 7.28 7.45 7.60 7.72 7.83 7.92 8.00;
4.00 4.03 4.07 4.14 4.26 4.48 4.85 5.26 5.63 5.95 6.21 6.43 6.61 6.75 6.88 7.00;
2.00 2.02 2.05 2.10 2.20 2.44 3.08 3.70 4.23 4.67 5.01 5.29 5.52 5.70 5.86 6.00;
0 0 0 0 0 0 1.33 2.24 2.93 3.47 3.88 4.21 4.46 4.67 4.84 5.00;
0 0 0 0 0 0 0 1.01 1.78 2.38 2.84 3.19 3.46 3.67 3.84 4.00;
0 0 0 0 0 0 0 0 0.80 1.43 1.91 2.25 2.51 2.70 2.86 3.00;
0 0 0 0 0 0 0 0 0 0.63 1.10 1.41 1.62 1.77 1.89 2.00;
0 0 0 0 0 0 0 0 0 0 0.44 0.66 0.79 0.88 0.94 1.00;
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];
data(data == 0) = NaN;

[x,y] = meshgrid(1:16,1:11);
contourf(x,y,data,20,'LineStyle','none');
colorbar

This is what I get:

enter image description here

Given your comments, you want the y-axis to be reversed. Simply put axis ij; at the end of the code above to flip the y-axis so that y-down is the positive direction. If you do that, we get this figure:

enter image description here

Credit should go to Kamtal as he figured out where you needed to start. I just helped finish off the requirement.

edited Nov 21, 2014 at 20:54

answered Nov 21, 2014 at 20:35

rayryeng

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4 Comments

user3780731 Over a year ago

Thank you so much!!! I got now I was not used to working with this function... However, how could I do it to get it inverse ( I mean the zeros are in the lower part on my array but in the plot the white part is on the upper side ) is there any way to turn it upside down? Thanks so much! @rayryeng

Rash Over a year ago

@user3780731, use data = data(end:-1:1,:); see if it is what you want. you can also use data = max(data(:)) - data to change colors.

rayryeng Over a year ago

You can reverse the axis by doing axis ij. Let me modify my post.

rayryeng Over a year ago

@user3780731 - You're welcome. Please accept Kamtal's (or mine if you want) answer to signify that you no longer need help.

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