如何使用MATLAB绘制出好看的火山图
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这里画了一个示例：
数据来源：http://blog.genesino.com/2017/07/volcanoPlot/
绘制效果：
代码及说明：
使用代码时只需要改一开始导入的数据，和代码提示中X坐标区域范围和Y坐标区域范围，完整代码如下所示：
% 读取数据
data=readmatrix('volcano.txt');
logFC=data(:,2);
padj=data(:,3);
DB_not=(padj>0.5)|(logFC<0.5&logFC>-0.5);
DB_up=padj<=0.05&logFC>=0.5;
DB_down=padj<=0.05&logFC<=-0.5;
ax=gca;
hold(ax,'on');
grid(ax,'on');
% 需要适度调整的属性：坐标区域范围及刻度===================================
ax.XLim=[-5,5];
ax.YLim=[-10,300];
ax.XTick=-5:2.5:5;
ax.YTick=0:50:300;
% =========================================================================
ax.XLabel.String='log_2(FoldChange)';
ax.XLabel.FontSize=14;
ax.XLabel.FontName='Cambria';
ax.XLabel.FontWeight='bold';
ax.YLabel.String='-log_{10}(padj)';
ax.YLabel.FontSize=14;
ax.YLabel.FontName='Cambria';
ax.YLabel.FontWeight='bold';
ax.Color=[235,235,235]./255;
ax.GridColor=[1 1 1];
ax.LineWidth=1.4;
ax.GridAlpha=0.5;
ax.XColor=[44,62,80]./255;
ax.YColor=[44,62,80]./255;
Hdl_not=scatter(logFC(DB_not),-log(padj(DB_not))./log(10),30,'filled',...
'MarkerFaceColor',[190,190,190]./255,'MarkerEdgeColor',[190,190,190]./255,...
'MarkerFaceAlpha',0.6);
Hdl_up=scatter(logFC(DB_up),-log(padj(DB_up))./log(10),30,'filled',...
'MarkerFaceColor',[196,88,62]./255,'MarkerEdgeColor',[196,88,62]./255,...
'MarkerFaceAlpha',0.6);
Hdl_down=scatter(logFC(DB_down),-log(padj(DB_down))./log(10),30,'filled',...
'MarkerFaceColor',[1,114,182]./255,'MarkerEdgeColor',[1,114,182]./255,...
'MarkerFaceAlpha',0.6);
plot([ax.XLim(1),ax.XLim(2)],[-log(0.05)/log(10),-log(0.05)/log(10)],...
'LineWidth',1.2,'Color',[.2,.2,.2],'LineStyle','-.')
plot([-0.5,-0.5],[ax.YLim(1),ax.YLim(2)],...
'LineWidth',1.2,'Color',[.2,.2,.2],'LineStyle','-.')
plot([0.5,0.5],[ax.YLim(1),ax.YLim(2)],...
'LineWidth',1.2,'Color',[.2,.2,.2],'LineStyle','-.')
lgd=legend(ax,[Hdl_up,Hdl_not,Hdl_down],{'up','not','down'});
lgd.Title.String='threshold';
lgd.FontSize=12;
lgd.Title.FontSize=13;
lgd.EdgeColor=[44,62,80]./255;
lgd.TextColor=[44,62,80]./230;
lgd.FontName='Cambria';
lgd.Location='best';
可以看到各种参数设置颇多，一切为了画图质量hiahiahia，要是懒得设置建议直接发复制粘贴，有更强的审美的可以自行改写嗷。
如果希望显示显示坐标区域外的点，请使用如下代码：
% 读取数据
data=readmatrix('volcano.txt');
logFC=data(:,2);
padj=data(:,3);
DB_not=(padj>0.5)|(logFC<0.5&logFC>-0.5);
DB_up=padj<=0.05&logFC>=0.5;
DB_down=padj<=0.05&logFC<=-0.5;
ax=gca;
hold(ax,'on');
grid(ax,'on');
% 需要适度调整的属性：坐标区域范围及刻度===================================
ax.XLim=[-8,8];
ax.YLim=[-10,200];
ax.XTick=-5:2.5:5;
ax.YTick=0:50:300;
% ==========================================================================
DB_down_out=(-log(padj)./log(10)>ax.YLim(2)&logFC<=-0.5)|logFC<ax.XLim(1);
DB_down_out_Set=[logFC(DB_down_out),-log(padj(DB_down_out))./log(10)];
DB_down_out_Set(DB_down_out_Set(:,1)<ax.XLim(1),1)=ax.XLim(1);
DB_down_out_Set(DB_down_out_Set(:,2)>ax.YLim(2),2)=ax.YLim(2);
DB_up_out=(-log(padj)./log(10)>ax.YLim(2)&logFC>=0.5)|logFC>ax.XLim(2);
DB_up_out_Set=[logFC(DB_up_out),-log(padj(DB_up_out))./log(10)];
DB_up_out_Set(DB_up_out_Set(:,1)>ax.XLim(2),1)=ax.XLim(2);
DB_up_out_Set(DB_up_out_Set(:,2)>ax.YLim(2),2)=ax.YLim(2);
% =========================================================================
ax.XLabel.String='log_2(FoldChange)';
ax.XLabel.FontSize=14;
ax.XLabel.FontName='Cambria';
ax.XLabel.FontWeight='bold';
ax.YLabel.String='-log_{10}(padj)';
ax.YLabel.FontSize=14;
ax.YLabel.FontName='Cambria';
ax.YLabel.FontWeight='bold';
ax.Color=[235,235,235]./255;
ax.GridColor=[1 1 1];
ax.LineWidth=1.4;
ax.GridAlpha=0.5;
ax.XColor=[44,62,80]./255;
ax.YColor=[44,62,80]./255;
Hdl_not=scatter(logFC(DB_not),-log(padj(DB_not))./log(10),30,'filled',...
'MarkerFaceColor',[190,190,190]./255,'MarkerEdgeColor',[190,190,190]./255,...
'MarkerFaceAlpha',0.6);
Hdl_up=scatter(logFC(DB_up),-log(padj(DB_up))./log(10),30,'filled',...
'MarkerFaceColor',[196,88,62]./255,'MarkerEdgeColor',[196,88,62]./255,...
'MarkerFaceAlpha',0.6);
Hdl_down=scatter(logFC(DB_down),-log(padj(DB_down))./log(10),30,'filled',...
'MarkerFaceColor',[1,114,182]./255,'MarkerEdgeColor',[1,114,182]./255,...
'MarkerFaceAlpha',0.6);
% -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -
scatter(DB_up_out_Set(:,1),DB_up_out_Set(:,2),30,'filled','Marker','+',...
'MarkerFaceColor',[196,88,62]./255,'MarkerEdgeColor',[196,88,62]./255,...
'MarkerFaceAlpha',0.6,'LineWidth',1);
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