Scatter plot with strings on x axis

I want to plot a scatter plot with sampling sites on x axis like S1, s2 names and on y axis I want to plot concentration of various metals. Also I want to divide the plot into sections as in the figure. If I am using xline command then it is plotting a line on the sampling sites but I want the dividing line to be between s2and S3.for example here in the picture the dividing line is between j5 and ju1 Can anyone help?

Answer 1

[Voss]

sites = compose("%s%d",["J" "Ju" "P" "R" "S" "W"].',1:5).';
sites = sites(:);
sites([12 14]) = [];

n_sites_per_group = [5 5 3 5 5 5];

elements = ["Cr" "Ni" "Cu" "Zn" "Cd" "Pb"];

n_sites = numel(sites);
n_elements = numel(elements);

data = 1.25*randn(n_sites,n_elements)-2; % random data

colors = [ ...
    0 0 1; ...
    0 0.6 0; ...
    1 0 0; ...
    0.6 0.6 0; ...
    0.6 0.6 0.6; ...
    0.6 0.6 0];
markers = 'osd^+*';

hold on
lines = zeros(1,n_elements);
for ii = 1:n_elements
    lines(ii) = line(1:n_sites,data(:,ii), ...
        'LineStyle','none', ...
        'Marker',markers(ii), ...
        'Color',colors(ii,:), ...
        'MarkerFaceColor',colors(ii,:), ...
        'DisplayName',elements(ii));
end

x_edges = [0 0.5+cumsum(n_sites_per_group(1:end-1)) n_sites+1]

x_edges = 1×7

0 5.5000 10.5000 13.5000 18.5000 23.5000 29.0000

xline(x_edges(2:end-1),'Color',[0.4 0.4 0.4]);

text((x_edges(1:end-1)+x_edges(2:end))/2,5.8*ones(1,numel(n_sites_per_group)), ...
    ["Jezewo" "Jutrosin" "Pakoslaw" "Rydzyna" "Sroda" "Wrzesnia"], ...
    'VerticalAlignment','top', ...
    'HorizontalAlignment','center', ...
    'FontWeight','bold', ...
    'FontSize',8);

xlim(x_edges([1 end]));
ylim([-8 6]);

xlabel('Sampling site','FontWeight','bold');
ylabel('I_{geo}','FontWeight','bold');

set(gca(), ...
    'Layer','top', ...
    'Box','on', ...
    'XTick',1:n_sites, ...
    'XTickLabels',sites, ...
    'TickLength',[0.005 0.005]);

y = (5:-1:0)+[0; 1; 1; 0];
x = repmat([0; 0; n_sites+[1; 1]],1,6);
c = repmat(linspace(0.5,0.95,6).',1,3);
p = patch( ...
    'XData',x, ...
    'YData',y, ...
    'FaceColor','flat', ...
    'FaceVertexCData',c, ...
    'EdgeColor','none');
ch = get(gca(),'Children');
set(gca(),'Children',[ch(ch ~= p); p]);

legend(lines,'Location','SouthEast','NumColumns',2);

[Roja Eliza]

thank you very much.It works perfectly. one doubt though, if I want to put data from excel sheet how do I put in ?

[dpb]

readtable

[Roja Eliza]

I have 14 elements and my y values range between 1 to 30,000 (like 1.6, 290,13000 these kind). I cann't seem to get the code right. whenever I change the value the patch dissapers. I want to set the Y values in logarithmically increasing value

[Voss]

@Roja Eliza Please start a new question explaining the situation, and include your code.

Answer 2

[dpb]

<scatter> can take a categorical variable as an x variable in which case you can get the text labels automagically -- however, the x-axis then will be categorical and have only integral values of those categories that can be plotted on it.

Your options are to either use a numeric category number for x and the set the tick labels as wanted with <xticklabels> which lets you write any string desired at any tick.

You can then draw the vertical lines at any x value you wish between the integral tick values.