Matlab setting & snippet

代码片段snippets

• 保存pdf调整a4纸至合适大小

h = figure;
plot(1:10);
set(h,'Units','Inches');
pos = get(h,'Position');
set(h,'PaperPositionMode','Auto','PaperUnits','Inches','PaperSize',[pos(3), pos(4)])
print(h,'filename','-dpdf','-r0')

• 缺省参数默认值设定

function f(arg1, arg2, arg3)
if ~exist('arg2', 'var')
    arg2 = arg2Default;
end

• plot-legend多行设置

hg1 = legend('第一条');
set(hg1,'FontSize',12,'Location', 'SouthOutside','box','off');  
%注：将legend放在图外面时，Legend 1不能通过鼠标移动，只能通过代码调整位置 
% ============= Legend 2 :
ah2 = axes('position',get(gca,'position'),'visible','off');
hg2 = legend(ah2, [p2 p3], '第二条', '第三条');
set(hg2,'FontSize',12,'Location', 'SouthOutside',...
        'Orientation','horizontal','box','off');

Another way:
legend({'cos(x)','cos(2x)','cos(3x)','cos(4x)'},'Location','northwest','NumColumns',2)

• mac打开时闪退 /Applications/Polyspace/R2019b.app/bin/matlab -nosplash
• matlab-mex命令 10.15.4问题 https://www.mathworks.com/matlabcentral/answers/512901-mex-xcodebuild-error-sdk-macosx10-15-4-cannot-be-located/?s_tid=mlc_lp_leaf

绘制等高线

contour(u, v, z, [-0.5, -0.5], 'LineWidth', 2)

区间是zlim