par

一、Framebuffer 设备驱动总体架构 帧缓冲设备为标准的字符型设备，在Linux中主设备号29，定义在/include/linux/major.h中的FB_MAJOR，次设备号定义帧缓冲的个数，最大允许有32个FrameBuffer，定义在/include/linux/fb.h中的FB_MAX，对应于文件系统下/dev/fb%d设备文件。 我们从上面这幅图看，帧缓冲设备在Linux中也可以看做是一个完整的子系统，大体由fbmem.c和xxxfb.c组成。向上给应用程序提供完善的设备文件操作接口(即对FrameBuffer设备进行read、write、ioctl等操作)，接口在Linux提供的fbmem.c文件中实现；向下提供了硬件操作的接口，只是这些接口Linux并没有提供实现，因为这要根据具体的LCD控制器硬件进行设置，所以这就是我们要做的事情了(即xxxfb.c部分的实现)。 二 、Framebuffer 相关的重要数据结构： 1、从Framebuffer设备驱动程序结构看，该驱动主要跟fb_info结构体有关，该结构体记录了Framebuffer设备的全部信息，包括设备的设置参数、状态以及对底层硬件操作的函数指针。在Linux中，每一个Framebuffer设备都必须对应一个fb_info，fb_info在/linux/fb.h中的定义如下：(只列出重要的一些) 1

Using R, I would like to plot a linear relationship between two variables, but I would like the fitted line to be present only within the range of the data. For example, if I have the following code, I would like the line to exist only from x and y values of 1:10 (with default parameters this line extends beyond the range of data points). x <- 1:10 y <- 1:10 plot(x,y) abline(lm(y~x)) Instead of using abline() , (a) save the fitted model, (b) use predict.lm() to find the fitted y-values corresponding to x=1 and x=10, and then (c) use lines() to add a line between the two points: f <- lm(y~x) X

I'm plotting multiple data series. colos=c('red','green','purple','pink','brown') par(new=F) for (i in 1:5) { plot(dat[[i+1]],col=colos[i],cex=marksize,xlab='Reading #',ylab = 'Current') par(new=T) } My plot looks like this: Is there a way I can overwrite the plot axis with each iteration, but not overwrite the plotted points? You may want to use the lines or points function(s) instead. Here's an example of how I usually go about this problem. This way you only overlay points on top of the existing plot, instead of plotting one plot on top of another. Plot the first one with your original plot

去Oracle行动 最近公司要发展海外项目，所以要将现有的系统全部平移过去，另外数据库也要从原来的 Oracle 变为 Mysql 。公司的数据库交互层面使用的是 Mybatis ，而 Oracle 与 Mysql 也有一些语法上的不同。所以在项目中的Sql要改动，但是多个项目中涉及到的Sql非常多，如果仅凭人工一条一条辨别的话，工作量有点大。所以就萌发出了直接将数据源变为Mysql，利用反射批量执行Mapper中的方法，然后如果有参数的话，就设置为默认的初始值，然后记录下来成功的数据和失败的数据，这样就可以根据失败原因进行修改。能够节省很大的时间。 执行效果 代码介绍 总体思路就三步 通过反射获得要执行的Mapper类的所有方法 获得方法中的参数，并赋值 执行 AutoTestMapper autoTestMapper = new AutoTestMapper("存放Mapper全路径名"); autoTestMapper.openSqlSession(sqlSessionFactory); 在构造函数中传入全路径名后，进行解析，解析出包名和所有的文件名并存储起来 public AutoTestMapper(String path) throws IOException, ClassNotFoundException { String mapperContent =

I'm reading the R help page for ?devAskNewPage (it was linked from ?par...ask ). I can't understand what par(ask=F) / par(ask=T) does. What do I need to read about to understand this: If the current device is the null device, this will open a graphics device. ... The precise circumstances when the user will be asked to confirm a new page depend on the graphics subsystem. Obviously this needs to be an interactive session. In addition ‘recording’ needs to be in operation, so only when the display list is enabled (see ‘dev.control’) which it usually is only on a screen device. What are devices,

I have a compilation of 4 plots drawn together with par(mfrow=c(2,2)) . I would like to draw a common title for the 2 above plots and a common title for the 2 below panels that are centered between the 2 left and right plots. Is this possible? This should work, but you'll need to play around with the line argument to get it just right: par(mfrow = c(2, 2)) plot(iris$Petal.Length, iris$Petal.Width) plot(iris$Sepal.Length, iris$Petal.Width) plot(iris$Sepal.Width, iris$Petal.Width) plot(iris$Sepal.Length, iris$Petal.Width) mtext("My 'Title' in a strange place", side = 3, line = -21, outer = TRUE)