How to plot a line graph calling specific depths from a table.

I have a data set with differing depths and need to plot three lines (depths 5, 25, 50) on one graph. Aside from sorting the data by ascending or descening, how can I force the graph to plot only values associated with the specific depth? Below is an example of my data.

Answer 1

[Voss]

T = table( ...
    datetime(["28-Jan-2025";"29-Jan-2025";"30-Jan-2025";"30-Jan-2025";"30-Jan-2025";"31-Jan-2025";"31-Jan-2025";"31-Jan-2025";"03-Feb-2025";"03-Feb-2025";"03-Feb-2025"]), ...
    [25;25;5;25;50;5;25;50;5;25;50], ...
    [0.84;2.4;1.7;1.8;7.5;1.8;2;2.3;28.1;28;29.4], ...
    'VariableNames',["Date","Depth","Turb"])

T = 11x3 table
       Date        Depth    Turb
    ___________    _____    ____

    28-Jan-2025     25      0.84
    29-Jan-2025     25       2.4
    30-Jan-2025      5       1.7
    30-Jan-2025     25       1.8
    30-Jan-2025     50       7.5
    31-Jan-2025      5       1.8
    31-Jan-2025     25         2
    31-Jan-2025     50       2.3
    03-Feb-2025      5      28.1
    03-Feb-2025     25        28
    03-Feb-2025     50      29.4

figure
hold on
[G,GID] = findgroups(T.Depth);
splitapply(@(d,t)plot(d,t),T(:,["Date","Turb"]),G)
legend("Depth="+GID)

[Anna]

Thank you so much!

[Voss]

You're welcome! Any questions, let me know. Otherwise, please "Accept" this answer. Thanks!

[Anna]

One more question. How can I code in a change to the individual lines? Colors and apperance?

[Voss]

An easy way is to modify the lines' properties after they are created, e.g.:

T = table( ...
    datetime(["28-Jan-2025";"29-Jan-2025";"30-Jan-2025";"30-Jan-2025";"30-Jan-2025";"31-Jan-2025";"31-Jan-2025";"31-Jan-2025";"03-Feb-2025";"03-Feb-2025";"03-Feb-2025"]), ...
    [25;25;5;25;50;5;25;50;5;25;50], ...
    [0.84;2.4;1.7;1.8;7.5;1.8;2;2.3;28.1;28;29.4], ...
    'VariableNames',["Date","Depth","Turb"])

T = 11x3 table
       Date        Depth    Turb
    ___________    _____    ____

    28-Jan-2025     25      0.84
    29-Jan-2025     25       2.4
    30-Jan-2025      5       1.7
    30-Jan-2025     25       1.8
    30-Jan-2025     50       7.5
    31-Jan-2025      5       1.8
    31-Jan-2025     25         2
    31-Jan-2025     50       2.3
    03-Feb-2025      5      28.1
    03-Feb-2025     25        28
    03-Feb-2025     50      29.4

figure
hold on
[G,GID] = findgroups(T.Depth);
h = splitapply(@(d,t)plot(d,t),T(:,["Date","Turb"]),G);
legend("Depth="+GID)

h(1).Color = 'm';
h(1).LineWidth = 2;
h(2).LineStyle = '--';
h(3).Marker = 'o';
h(3).Color = [1 0.5 0];

https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.line-properties.html

[Anna]

Thank you again

[Voss]

You're welcome!