Why is this plot deleted?

Question

Cary 2015-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/248690-why-is-this-plot-deleted

评论： Star Strider 2015-10-15

As soon as I get to set(gca) the plot disappears. If I continue I get the date formatted tick labels but I don't show any plot. Thanks

plot(matrix(:,1),matrix(:,7));
axis tight
xlabel('Date');
ylabel('PnL');
set(gca,'xtick',linspace(733645,736117,50)); % label 10 ticks using start/end
datetick('x',2,'keepticks'); %convert serial number to date
ax=gca; % get current axis
ax.XTickLabelRotation=45; % rotate ticks 45 degrees

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Answer 1

Star Strider 2015-10-15

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Apparently, the first set call was the problem. I don’t have your ‘matrix’ variable, but for datetick to work, matrix(:,1) have to be date numbers. After that, combine the set arguments in one call.

This works:

matrix(:,1) = linspace(733645,736117,20);
matrix(:,7) = randn(1,20);
plot(matrix(:,1),matrix(:,7));
axis tight
xlabel('Date');
ylabel('PnL');
datetick('x',2,'keepticks'); %convert serial number to date
set(gca,'xtick',linspace(733645,736117,50), 'XTickLabelRotation',45, 'FontSize',6); % label 10 ticks using start/end