Plot files with legend names indicated from a value from each file

Question

Adi Purwandana 2024-11-8，1:52

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评论： Star Strider 2024-11-8，15:03

Hello there,

I have 4 files, each of them containing 3 parameters in a matlab table, namely: z, station, and temp. I made a loop to plot the z-temp. My intention is I want to get the legend for each station plot with the number (name) of the station, where the name of each station is indicated in column station in each file of the station. See the files attached.

Here is my code so far which is unfortunatelly (offcourse) it gives a 'common' legend. It must be 11, 13, 15, 18 indeed.

clear all;
clc;
A=dir('*.mat');
numprof = length(A);
couleur = jet(numprof);
for nn=1:length(A)
    filename        = A(nn).name;
    B               = load(filename);
    z               = B.T.z(:,1);
    T               = B.T.temp(:,1);
    sta             = B.T.station(:,1);
    plot(T,z,'LineWidth',1,'color',couleur(nn,:));
    hold on;
end
legend('show'); % the legend I want is the name of the station, indicated from coulumn sta of each statio file, not the number of the profile
set(gca,'Ydir','reverse')

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Answer 1

Star Strider 2024-11-8，2:10

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https://ww2.mathworks.cn/matlabcentral/answers/2164775-plot-files-with-legend-names-indicated-from-a-value-from-each-file#answer_1542655

编辑：Star Strider 2024-11-8，2:19

在 MATLAB Online 中打开

All the files have the same format, so this is straightforward —

mats = dir('*.mat');

numprof = numel(mats);

couleur = jet(numprof);

for k = 1:numel(mats)

matname{k,:} = mats(k).name;

LD = load(matname{k});

T{k} = LD.T;

end

matname{:}

ans = 'statio_a.mat'

ans = 'statio_b.mat'

ans = 'statio_c.mat'

ans = 'statio_d.mat'

figure

hold on

for k = 1:numel(T)

D = T{k};

station1 = extractBefore(matname{k},'.'); % Station Names With Subscripts

station2 = strrep(extractBefore(matname{k},'.'),'_','\_'); % Station NNames As In Original File Names

plot(D.z, D.temp, DisplayName=station2, LineWidth=1, Color=couleur(k,:))

end

hold off

grid

xlabel('z')

ylabel('temp')

legend('Location','best')

There are two options for the legend entries, one with the different fille names as subscripts, and one wiith the names as they exist. This example uses the second option.

EDIT — Corrected typographical errors.

.

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Star Strider 2024-11-8，11:43

在 MATLAB Online 中打开

‘Anyway, my last questions for this thread:’

‘(1) Is it possible to add a title for the legend in matlab? For example "Station Number" as the title of the legend.’

Yes. However, I do not now remember when that was added. It is possible in R2024b, and several earlier releases.

‘(2) From my example files above, is it possible to get the maximum (the highest) and minimum (the lowest) value from all files? For example, I want to get the highest and lowest temp (considering all values of temp from all stations).’

Yes. Here, the easiest way is to use the bounds function to extract both into separate vectors, and then take the maximum and minimum of the respective vectors. (I also did that to get the maximum value for ‘z’ in order to position the minimum valuee text object accurately and adaptively.)

Try this —

mats = dir('*.mat');

numprof = numel(mats);

couleur = jet(numprof);

for k = 1:numel(mats)

matname{k,:} = mats(k).name;

LD = load(matname{k});

T{k} = LD.T;

end

matname{:}

ans = 'statio_a.mat'

ans = 'statio_b.mat'

ans = 'statio_c.mat'

ans = 'statio_d.mat'

figure

hold on

for k = 1:numel(T)

D = T{k};

station1 = extractBefore(matname{k},'.'); % Station Names With Subscripts

station2 = strrep(extractBefore(matname{k},'.'),'_','\_'); % Station NNames As In Original File Names

plot(D.z, D.temp, DisplayName=station2, LineWidth=1, Color=couleur(k,:))

[temp_min(k),temp_max(k)] = bounds(D.temp);

[z_min(k),z_max(k)] = bounds(D.z);

end

temp_max = max(temp_max);

temp_min = min(temp_min);

z_max = max(z_max);

text(75, temp_max, sprintf('\\leftarrow T_{max} = %.2f°C',temp_max), 'Horiz','left', 'Vert','middle')

text(z_max, temp_min, sprintf('T_{min} = %.2f°C\n\\downarrow',temp_min), 'Horiz','left', 'Vert','bottom')

hold off

grid

xlabel('z')

ylabel('temp')

hlgd = legend('Location','best');

title(hlgd, 'Station Number')

.

Adi Purwandana 2024-11-8，14:53

Thank you @Star Strider! That's really helping!

Star Strider 2024-11-8，15:03

My pleasure!

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Answer 2

Walter Roberson 2024-11-8，2:14

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https://ww2.mathworks.cn/matlabcentral/answers/2164775-plot-files-with-legend-names-indicated-from-a-value-from-each-file#answer_1542660

在 MATLAB Online 中打开

plot(T,z,'LineWidth',1,'color',couleur(nn,:), 'DisplayName', string(sta(1)));

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Adi Purwandana 2024-11-8，10:03

编辑：Adi Purwandana 2024-11-8，10:28

Thank you @Walter Roberson for the solution and also @Star Strider for such fruitful additional solutions I may use for future projects. Great!

Anyway, my last questions for this thread:

(1) Is it possible to add a title for the legend in matlab? For example "Station Number" as the title of the legend.

(2) From my example files above, is it possible to get the maximum (the highest) and minimum (the lowest) value from all files? For example, I want to get the highest and lowest temp (considering all values of temp from all stations).

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Plot files with legend names indicated from a value from each file

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Plot files with legend names indicated from a value from each file

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