Plot different markers on the same graph based on “if-else” statement (third parameter) in AppDesigner

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FEH 2023-4-5

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https://ww2.mathworks.cn/matlabcentral/answers/1941624-plot-different-markers-on-the-same-graph-based-on-if-else-statement-third-parameter-in-appdesign

评论： FEH 2023-4-6

采纳的回答： Cameron

Hi,

I have a table of data that I read from Excel using readtable in AppDesigner. The data consists of Lat,Long and Type.

Based on "Type", I would like to plot the Lat (Y) and Long (X) using 2 different markers.

i.e. if Type="A", plot the X & Y coordinates using "+" type marker.

if Type = "B", plot the X & Y coordinates using "square" type marker.

I have try using this kind of coding

.....

t = readtable(Grid.xlsx,opts);

app.UITable.Data = t;

x = app.UITable.Data.Long;

y = app.UITable.Data.Lat;

hold(app.UIAxes,'on')

if strcmp (app.UITable.Data.Type, 'A')

scatter(app.UIAxes,x,y,'+','black');

else

scatter(app.UIAxes,x,y,'square','blue');

end

However, MATLAB plots all the X & Y coordinates using the "+" type marker.

Please advise and thanks in advance

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Answer 1

Cameron 2023-4-5

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https://ww2.mathworks.cn/matlabcentral/answers/1941624-plot-different-markers-on-the-same-graph-based-on-if-else-statement-third-parameter-in-appdesign#answer_1209554

编辑：Cameron 2023-4-5

在 MATLAB Online 中打开

You should use indexing instead.

t = readtable(Grid.xlsx,opts);
app.UITable.Data = t;
x = app.UITable.Data.Long;
y = app.UITable.Data.Lat;
groupA = string(app.UITable.Data.Type) == "A";
groupB = string(app.UITable.Data.Type) == "B";
hold(app.UIAxes,'on')
scatter(app.UIAxes,x(groupA),y(groupA),'+','black');
scatter(app.UIAxes,x(groupB),y(groupB),'s','blue');
hold(app.UIAxes,'off')