How to change y axis label with percentage?

I would much appreciate some help with this. I have the code, written below, and I want to change to the y-axis label to be something like yaxis = [-50 0 50 100] and these values in %. I managed to get the y-axis values with percentages but I didn't manage to change to my desired interval. I would like something like the image attached, but with % included. any thoughts?

x = [1,2,3,4,5,6,7,8];

y = [2.8, 3.33, 4.8,2.1,2.5,0.35,3.4,1.6];

figure

plot (x,y,'*');

a = [cellstr(num2str(get(gca,'ytick')'))];%convert y-axis values to percentage values

pct = char(ones(size(a,1),1)*'%');%create a vector of '%' signs

new_yticks = [char(a),pct]; %append the '%' signs after the percentage values

set(gca,'yticklabel',new_yticks) %reflect the changes on the plot

ax = gca;

ax.YGrid = 'on'

xlabel('Patient');

ylabel('Percent Difference');

[Jan]

a = [cellstr(num2str(get(gca,'ytick')'))];
pct = char(ones(size(a,1),1)*'%');

This is much too difficult. There is no need for square brackets in the first line. The 2nd can be simplified: repmat('%', size(a,1), 1).

Answer 1

[Jan]

x = [1,2,3,4,5,6,7,8];
y = [2.8, 3.33, 4.8,2.1,2.5,0.35,3.4,1.6];
figure
ax = axes;
plot (x,y,'*');
set(ax, 'YTick', [-50, 0, 50, 100], 'YLim', [-50, 100]);
ytickformat(ax, 'percentage');
ax.YGrid = 'on'
xlabel('Patient');
ylabel('Percent Difference');

Alternatively:

ytickformat(ax, '%g%%');

Answer 2

[Star Strider]

I am not certain what result you want.

Try this:

x = [1,2,3,4,5,6,7,8];
y = [2.8, 3.33, 4.8,2.1,2.5,0.35,3.4,1.6];

figure(1)
plot (x,y,'*');
y_pct_lbl = [-50 0 50 100];                                             % Desired Labels
yt_orig = get(gca, 'YTick');                                            % Original Y-Tick Values & Labels
yt_new = linspace(min(yt_orig), max(yt_orig), numel(y_pct_lbl));        % New Y-Tick Values
yt_lbl = regexp(sprintf('%d %%\n', y_pct_lbl), '\n', 'split');          % New Y-Tick Labels
set(gca, 'YTick',yt_new, 'YTickLabel',yt_lbl(1:end-1))                  % Change Y-Tick Labels

[Clancy Tan]

Thank you for your info, it worked for me perfectly!

[Star Strider]

My pleasure!

[Martim Zurita]

Worked for me too! :)

[Star Strider]

My pleasure!