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axistight;                    % 緊坐標(biāo)軸
axisequal;                    % 等比坐標(biāo)軸
axis([-0.1, 8.1, -1.1, 1.1]);   %坐標(biāo)軸的顯示范圍

x = -pi/2:0.01:pi; 
plot(x,sin(x))                 %先繪制個(gè)基本圖形

% gca: gca, h=figure(...);
set(gca, 'XLim',[-pi/2pi]);                  % X軸的數(shù)據(jù)顯示范圍
set(gca,'XTick',[-pi/2:pi/4:pi]);        % X軸的記號(hào)點(diǎn) 
set(gca,'XTickLabel',{'-pi/2' '-pi/4:' '0' 'pi/4' 'pi/2' 'pi*3/4''pi'})   % X軸的記號(hào)
set(gca,'XGrid','on');                   % X軸的網(wǎng)格
set(gca,'XDir','reverse');               % 逆轉(zhuǎn)X軸
set(gca,'XColor','red');                 % X軸的顏色