Trouble displaying single value of a structured array

Within the Command Window, I've first loaded global coastline by

load('ocean_coast.mat')

The fields are 'area','Lat','Lon','BoundingBox','id' & 'level'. The array length is 179837.

When I try to look at just one value, for example, by fprintf('Lat %2f \n',ocean_coast(1).Lat), I get all of the latitudes. I've tried with 'disp' also.

I haven't tried the smaller data set of lake coast data yet.

What is it that I'm doing wrong? Do I need to filter by size?

[Stephen23]

Please show the output of this command:

whos ocean_coast

[BobG]

Name Size Bytes Class Attributes

ocean_coast 179837x1 358202698 struct

[Stephen23]

Please show the output of these commands:

A = ocean_coast(1).Lat;
whos A

[BobG]

>> A = ocean_coast(1).Lat;

>> whos A

Name Size Bytes Class Attributes

A 1x1160927 9287416 double

[James Tursa]

That's a vector of many values. So if you only want to look at the first value, e.g.,

ocean_coast(1).Lat(1)

Answer 1

[Sachin]

Hi Chandra,

I understand that you want to display single value of structured array.

A possible workaround be finding the size of the values of field “Lat”. Since you are getting all the “Lat” values so there may be multiple “Lat” values at that index.

You need to first find out the size of the field and try to access the data of that field.

You can try following MATLAB code to find size.

load('ocean_coast.mat');
length(ocean_coast(1).Lat);
disp(ocean_coast(1).Lat(1));

Thanks

Sachin