Match name to axis value in chart

 load('matlab_pl.mat')
 
stem(pl(:,2))
 ff= find(pl(:,2));
  ax = gca;
ax.XTickLabel=pl(ff,1);

hi, i see that the name axis not corrisponding on axis value <>0

and if possibile to avoid overlapping I would like to write the number under its own bar as in the example

Answer 1

[Star Strider]

Apparently, you want to put all the labels in the negative part of the y-axis.

Try this —

load('matlab_pl.mat')

stem(pl(:,2))
ff= find(pl(:,2));
ax = gca;
% ax.XTickLabel=pl(ff,1);
ylim('padded')
xval = ff;
tval = pl(ff,1);
yval = pl(ff,2);
lval = zeros(size(yval));                                                                               % Label Positions
lval(yval<0) = yval(yval<0);                                                                            % Label Positions
lval(yval>0) = yval(yval>0)-max(yval(yval>0));                                                          % Label Positions
text(xval, lval-0.02, compose('%d',tval), Horiz='center', Vert='top', FontSize=9, FontWeight='bold')

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Make appropriate changes to get the result you want.

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Answer 2

[Image Analyst]

How about this:

load('matlab_pl.mat')
x = pl(:, 1);
y = pl(:, 2);
stem(x, y, 'Filled', 'LineWidth', 2);
grid on;
xticklabels("")
bigStemIndexes = find(y ~= 0);
for k = 1 : length(bigStemIndexes)
    xs = x(bigStemIndexes(k));
    ys = y(bigStemIndexes(k));
    if ys > 0
        str = sprintf('%d\n', xs);
    	text(xs, ys, str, ...
    		'HorizontalAlignment','center',...
    		'VerticalAlignment','bottom', 'FontWeight','bold')
    else
        str = sprintf('\n%d', xs);
    	text(xs, ys, str, ...
    		'HorizontalAlignment','center',...
    		'VerticalAlignment','top', 'FontWeight','bold')
    end
end

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