How do I plot different fields of a structure in a loop?

2 次查看（过去 30 天）
Mackenzie Maher
Mackenzie Maher 2021-10-15
评论： Image Analyst 2022-12-5
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

请先登录，再回答此问题。

采纳的回答

Image Analyst
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
显示 1更早的评论
Image Analyst
Image Analyst 2022-12-5
Ran in:
@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)
indexesToKeep = 5×1 logical array
0 1 1 0 1
fieldNames = fieldNames(indexesToKeep)
fieldNames = 3×1 cell array
{'R33'} {'R34'} {'R42'}
% 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
Plotting R33. Plotting R34. Plotting R42.
grid on;
legend(legendStrings)
Image Analyst
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?

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Graphics Performance 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by