转载：米-曼氏方程绘图的R解决方案

米-曼氏方程绘图的R解决方案 @桢和他的朋友们

1 #换一种数据组合方式，增加分组列，便于用colour或shape表示不同组
2 biochem_1 = data.frame(
3  concen = c(1/concen,1/concen),
4  velocity = c(1/velocity,1/velocity_inhibit),
5  gruops = c(rep(“control”,8),rep(“inhibited”,8))
6 )#已经取好倒数了
7
8 #画的时候美化一下，注意pgeom_point直接使用ggplot中的mapping即可。
9 ggplot(data = biochem_1,aes(x=concen,y=velocity,colour = gruops))+
10  geom_point(size=3,alpha=0.8)+
11  geom_abline(intercept = fitted_model$coefficients[[1]],
12              slope = fitted_model$coefficients[[2]],
13              size=1,color=”lightgray”)+
14  geom_abline(intercept = fitted_model_inhibit$coefficients[[1]],
15              slope = fitted_model_inhibit$coefficients[[2]],
16              size=1,color=”lightgray”)+
17  scale_x_continuous(limits = c(-0.4,1.6))+
18  scale_y_continuous(limits = c(-0.005,0.11))+
19  labs (title=”酶促反应动力学实验”,x=”1/[S]“,y=”1/v”)+
20  theme_light()+
21  theme(
22    plot.title = element_text(hjust = 0.5),
23    legend.background = element_roundrect(fill=NA,r=0.15,color = “lightgray”)
24  ) +
25  geom_hline(aes(yintercept=0))+
26  geom_vline(aes(xintercept=0))+
27  scale_colour_discrete(name  =”组别”,
28                        breaks=c(“control”, “inhibited”),
29                        labels=c(“对照组”, “抑制剂组”))

第一步 导入数据

data = read.table(header = T, row.names = 1,
text = '
序号 浓度倒数 无抑制剂 有抑制剂
11.60000 0.05607 0.12833 
21.40000 0.07911 0.08462 
31.20000 0.05848 0.06696 
41.00000 0.04894 0.06979 
50.80000 0.03080 0.06095 
60.60000 0.02658 0.05168 
70.40000 0.02104 0.03479 
80.20000 0.02183 0.02552 
')

第二步 拟合直线

`无抑制剂` = lm(`无抑制剂`~`浓度倒数`,data = data[-c(2,3,8),])
`有抑制剂` = lm(`有抑制剂`~`浓度倒数`,data = data[-3,])
s3 <- summary(`无抑制剂`)
s4 <- summary(`有抑制剂`)

第三步 绘图

f_gp_xyn <- function(df, xix=1){
    if(is.character(xix)){
        xix = which(colnames(df) == xix)
    }
    lc_x = rep(df[,xix], ncol(df) - 1)
    lc_y = NULL
    lc_g = NULL
    lc_n = nrow(df)
    for (lc_c in colnames(df)[-xix]){
        lc_y = c(lc_y, df[, lc_c])
        lc_g = c(lc_g, rep(lc_c, lc_n))
    }
    data.frame(x = lc_x, y = lc_y, g = as.factor(lc_g))
}

• 简易版，不支持移除无效点

options(repr.plot.width=12, repr.plot.height=12)
options(ggrepel.max.overlaps = Inf)
require(ggplot2)

ggplot(data = f_gp_xyn(data),aes(x=x,y=y,colour = g, shape = g))+
geom_point(size=3,alpha=0.8) + 
stat_smooth(method = 'lm', se = FALSE)

• 正式版

options(repr.plot.width=12, repr.plot.height=12)

ggplot(data = f_gp_xyn(data),aes(x=x,y=y,colour = g, shape = g))+
geom_point(size=3,alpha=0.8) + 
geom_abline(intercept = s3$coefficients[[1]], slope = s3$coefficients[[2]], linetype="dashed")+ 
geom_abline(intercept = s4$coefficients[[1]], slope = s4$coefficients[[2]], linetype="dashed")+
scale_x_continuous(limits = c(-0.4,1.6), breaks=seq(-0.4, 1.6, 0.1))+
scale_y_continuous(limits = c(0,0.14), breaks=seq(0, 0.14, 0.005))+
labs (title="Lineweaver-Burk equation",x="1/[S]",y="1/v")+
theme_light() +
theme_bw(base_size=18) +
theme(plot.title = element_text(hjust = 0.5),
    axis.text.y = element_text(size = 12),
    axis.text.x = element_text(size = 12, angle=90))+
geom_hline(aes(yintercept=0))+geom_vline(aes(xintercept=0))+
scale_shape_discrete(name="group",
    labels=c("control", "inhibited"))+
scale_color_discrete(name="group",
    labels=c("control", "inhibited"))

ggsave("example2.pdf")