How do I plot different fields of a structure in a loop?
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Hi all.
I'm very new to Matlab and I'm trying to create a loop that plots everything between these 2 lines of code:
scatter(MCR_full.MIB035.Reaches.R32.kin(:,1),MCR_full.MIB035.Reaches.R32.kin(:,3))
scatter(MCR_full.MIB035.Reaches.R42.kin(:,1),MCR_full.MIB035.Reaches.R42.kin(:,3))
so it would plot the following
scatter(MCR_full.MIB035.Reaches.R32.kin(:,1),MCR_full.MIB035.Reaches.R32.kin(:,3))
scatter(MCR_full.MIB035.Reaches.R33.kin(:,1),MCR_full.MIB035.Reaches.R33.kin(:,3))
scatter(MCR_full.MIB035.Reaches.R34.kin(:,1),MCR_full.MIB035.Reaches.R34.kin(:,3))
and so on all the way to
scatter(MCR_full.MIB035.Reaches.R42.kin(:,1),MCR_full.MIB035.Reaches.R42.kin(:,3))
all in the same plot. The RNN field name changes with each call to scatter.
Any help with this would be fantastic thanks so much
采纳的回答
Image Analyst
2021-10-15
Use dynamic field names:
% Create sample data
MCR_full.MIB035.Reaches.R32.kin = rand(100, 3)
MCR_full.MIB035.Reaches.R33.kin = rand(100, 3)
MCR_full.MIB035.Reaches.R34.kin = rand(100, 3)
MCR_full.MIB035.Reaches.R41.kin = rand(100, 3)
MCR_full.MIB035.Reaches.R42.kin = rand(100, 3)
% Get all the fieldnames.
fieldNames = fieldnames(MCR_full.MIB035.Reaches)
% Get data from each field and plot it.
for k = 1 : numel(fieldNames)
thisFieldName = fieldNames{k};
fprintf('Plotting %s.\n', thisFieldName);
thisArray = MCR_full.MIB035.Reaches.(thisFieldName).kin;
x = thisArray(:, 1);
y = thisArray(:, 3);
% Unique, random color for each.
thisColor = rand(1, 3);
% Do the scatter plot
scatter(x, y, 30, thisColor, 'filled');
hold on; % Don't let subsequent plots blow away earlier ones.
end
grid on;
3 个评论
I'm looking to do something similar... in the above example, what if you only wanted to plot R33, R34, and R42 (a subset of the fields) of MCR_full.MIB035.Reaches?
I have a structure with many fields but only want to plot some of those fields in my for loop.
I would also like to plot over the previous field, but I suspect that is a matter of not using the hold on function.
@Josh Tome, use ismember to get a list of those fieldnames which are in the list of ones you want to keep.
% Create sample data
MCR_full.MIB035.Reaches.R32.kin = rand(100, 3);
MCR_full.MIB035.Reaches.R33.kin = rand(100, 3);
MCR_full.MIB035.Reaches.R34.kin = rand(100, 3);
MCR_full.MIB035.Reaches.R41.kin = rand(100, 3);
MCR_full.MIB035.Reaches.R42.kin = rand(100, 3);
% Get all the fieldnames.
fieldNames = fieldnames(MCR_full.MIB035.Reaches);
fieldNamesToPlot = {'R33', 'R34', 'R42'};
indexesToKeep = ismember(fieldNames, fieldNamesToPlot)
fieldNames = fieldNames(indexesToKeep)
% Get data from each field and plot it.
for k = 1 : numel(fieldNames)
thisFieldName = fieldNames{k};;
fprintf('Plotting %s.\n', thisFieldName);
thisArray = MCR_full.MIB035.Reaches.(thisFieldName).kin;
x = thisArray(:, 1);
y = thisArray(:, 3);
% Unique, random color for each.
thisColor = rand(1, 3);
% Do the scatter plot
scatter(x, y, 30, thisColor, 'filled');
hold on; % Don't let subsequent plots blow away earlier ones.
legendStrings{k} = thisFieldName;
end
grid on;
legend(legendStrings)
Image Analyst
2022-12-5
@Josh Tome not sure what "I would also like to plot over the previous field, but I suspect that is a matter of not using the hold on function." means. My code plots what you wanted to plot. If you don't have hold on, it will blow away everything and plot everything from scratch. If you have hold on it will add those data markers to the existing plot. Did you try the code in my last comment? If not, why not?
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