MATLAB Answers


Question regarding data grid

Asked by desert_scientist90 on 22 Oct 2019 at 2:35
Latest activity Edited by Cris LaPierre
on 23 Oct 2019 at 3:12
Hi I have a data set on a 0.5 grid, the dimension for x is 141, y is 71 and t is 38. I am trying to calculate the z score which I already did. I am trying to plot the the Z scores on a time series but since is greater than two dimensions is not possible to do it. Is there anyway to work around this without ruining the yearly data? Thanks in advance for your help


on 22 Oct 2019 at 10:59
Attach some example and data
val(:,:,1) =
Columns 1 through 8
0.8697 -0.2439 -0.4631 -0.2680 -0.2385 0.1420 0.0102 -1.0239
Columns 9 through 16
-1.1259 -1.5321 -1.5886 -1.8558 -1.9435 -1.7930 -2.1038 -2.2191
Columns 17 through 24
-1.9535 -2.0331 -2.0710 -1.0314 -0.1241 0.3457 0.9845 1.2666
Columns 25 through 32
1.1053 1.0737 1.1622 1.5579 1.6004 2.2580 1.0220 0.6942

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2 Answers

Answer by Cris LaPierre
on 23 Oct 2019 at 2:03

The uploaded file contains a single variable with size 1x71x38. If that is correct, just use the squeeze function to remove the singleton dimension.
Z = squeeze(Z);
The new size of Z is 71x38.
From here you can create a line plot for each column
or a 3D surface


Cris LaPierre
on 23 Oct 2019 at 2:42
I'm not sure that's the way you want to visualize this data. Viewing that way makes it hard to see any patterns. Having each year be it's own line makes it easier to observe a yearly pattern related to the value of y.
When plotting so X is year, it is connecting data points across years, masking any yearly trend (line 1 = first data point from each year, line 2 = second data point from each year, etc).
Cris LaPierre
on 23 Oct 2019 at 3:12
I'm pretty sure this plot was created using the code
Here, the values of X represent the index of the data point. The command Z(:) turns the entire array into a one-column vector. You can see that syntax described in this doc page. What that means is all the columns were placed head-to-tail. There are 71*38 data points, or 2698.

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Answer by desert_scientist90 on 23 Oct 2019 at 2:49

I am trying to have one line for the 38 years which I got earlier but with the frequency which is 2698 instead of the years. When I was trying to do the plot the error message I was getting was that the vectors were not the same lenght. I am new to matlab i have spent hours trying to get this graph right. But I guess thats part of the process of learning to use something new.


Cris LaPierre
on 23 Oct 2019 at 2:57
Yes, learning requires some practice. If you are brand new, have you gone through MATLAB Onramp? It might help introduce you in a guided, incremental way.
Cris LaPierre
on 23 Oct 2019 at 3:02
I'm afraid I don't know enough about your data to tell you how you should combine the values to get a single line of data for all 38 years.

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