Matlab Plot Latitude and Longitude with degree symbol on the axis label

Not the complete code, but it does the job.

close all
load coast
cfigure( 40, 20);
plot(long, lat, 'k')
grid on
% s = sprintf('45%c', char(176));

set(gca,'XLim',[-180 180])
set(gca,'YLim',[-180/2 180/2])
set(gca,'XTick',[-180:40: 180])
set(gca,'YTick',[-90:30: 90])

xt=get(gca,'xtick');
for k=1:numel(xt);
xt1{k}=sprintf('%d°',xt(k));
end
set(gca,'xticklabel',xt1);

xt=get(gca,'ytick');
for k=1:numel(xt);
xt1{k}=sprintf('%d°',xt(k));
end
set(gca,'yticklabel',xt1);

set(gca,'Fontsize',26)

annotation('textbox', [.15  .232 0.16  0.1 ],'EdgeColor',[ 0 0 0] )

% xlim([-180 180])
% ylim([-90 90])
hold on
plot(longitude(dayyes==0), latitude(dayyes==0), 'o', 'MarkerEdgeColor','b','MarkerSize',5);
plot(longitude(dayyes==1),latitude(dayyes==1), '*', 'MarkerEdgeColor','r','MarkerSize',6);
text(-167,-50,  sprintf('* Day Profile  ' ), 'color', 'r', 'FontSize', 26)
text(-167,-60,  sprintf('o Night Profile' ), 'color', 'b', 'FontSize', 26)
%    annotation('textbox', [-175  -55 20  15 ],'EdgeColor',[0 0 0] )
ylabel('Latitude ', 'FontSize', 26)
xlabel('Longitude ', 'FontSize', 26)
set(gcf,'Color','white')