# Plot figure for certain elements of readtable output

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mark savage 2022 年 7 月 20 日

Hi,
I have a readtable output, T, = (for example):
Longitude | Latitude
1 34
1 56
1 57
4 72
4 44
4 124
I want to plot a graph of Long vs Lat but only for Long = 1 (so the coordinates of this graph will be: (1, 34), (1, 56), (1, 57).
I tried this code but it just gives me a matlab crash report, I assume cause it requires a lot of iterations for my actual readtable output. Also, I just end up getting a bunch of empty figures:
for long_ind = numel(T{1,1}.Longitude)
while T{1,1}.Longitude(long_ind,1)==1
figure
plot(T{1,1}.Longitude(long_ind,1),T{1,1}.Latitude(long_ind,1))
hold on
end
end
Thank you

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### 回答 (2 件)

Jonas 2022 年 7 月 20 日
you can use directly index the variables of the table:
tbl=table();
tbl.long=[1 2 3 4 4 4];
tbl.lat=[34 56 57 72 44 124];
myCond=tbl.long<=3; % change as you want
plot(tbl.long(myCond),tbl.lat(myCond));
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Abderrahim. B 2022 年 7 月 20 日

Hi!
As per my understading of your question, the code below should work:
%% Create table with 2 variables (Log and Lat)
data = table([1 1 1 4 4 4].', [34 56 57 72 44 124].' , 'VariableNames',["Long", "Lat"]) ;
long = data.Long;
lat = data.Lat ;
%% Plot Long vs Lat (Long = 1)
figure
hold on
plot([lat(long == 1) lat(long == 1)], [long(long ==1) long(long == 1)],'r' )
Bonus: The below lines of code are just to make plot more readable
% Add coordinates as "points" using satter func
scatter([lat(long == 1) lat(long == 1)], [long(long == 1) long(long == 1)], 'filled')
offset = 0.1 ; % just to not overlap point with text
% Plot annotation
text( lat(long == 1) ,long(long == 1) + offset, strcat( num2str(long(long == 1)), ',' ,num2str(lat(long == 1)) ))
xlabel Latitude
ylabel Longitude
title ("Long vs Lat (Long = 1)")
Hope this help

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