histogram

问题 I am a newbie in R. I need to generate some graphs. I imported an excel file and need to create a histogram on one column. My importing code is- file=read.xlsx('femalecommentcount.xlsx',1,header=FALSE) col=file[2] col looks like this (part) - 36961 1 36962 1 36963 7 36964 1 36965 2 36966 1 36967 1 36968 4 36969 1 36970 6 36971 3 36972 1 36973 6 36974 6 36975 2 36976 2 36977 8 36978 2 36979 1 36980 1 36981 1 the first column is the row number. I'm not sure how to remove this. The second column

问题 From the docs: im.histogram() => list Returns a histogram for the image. The histogram is returned as a list of pixel counts, one for each pixel value in the source image. If the image has more than one band, the histograms for all bands are concatenated (for example, the histogram for an “RGB” image contains 768 values). I understand that there are 256 values for Red, 256 for Green and 256 for Blue (256 * 3 = 768). for i, value in enumerate(im.histogram()): print i, value Produces: 0 329 1

问题 I'm trying to port a .NET app to Android where I capture each frame from the camera and then modify it accordingly to user settings before displaying it. Doing it in .NET was simple since I was able to simply query the camera for the next image and I would get a bitmap that I could access at will. One of the many processing options requires the application to obtain the intensity histogram of each captured image and then do some modifications to the captured image before displaying the result

问题 How do I increase the quality in gnuplot? It seems like it's a very low-res image. Here's the contents of the file i'm using: linkage.plot set terminal pdf set out 'linkage.pdf' set title "Distribution of Scores" set xlabel "Score Value" set ylabel "Appearences" set yrange [0:50000] set xrange [0:70] binwidth=.25 bin(x,width)=width*floor(x/width) plot 'linkage.dat' using (bin($1,binwidth)):(1.0) title "Scores"\ smooth freq with boxes 回答1: gnuplot pdf output is usually pretty good (it's

问题 Inspired by this question, how do you make the same kind of plot in python? This plot aims at having a nice visual representation of how your distribution is off of the expected distribution. It hangs the bars of your histogram to the expected distribution line, so the difference to the expected value is read between the bottom of the bar and the x-axis, instead of between the top of the bar and the expected distribution curve. I could not find any built in function. 回答1: The idea is to just

问题 I need to generate an image similar to the one shown in this example: The difference is that, instead of having the scattered points in two dimensions, I have a two-dimensional histogram generated with numpy's histogram2d and plotted using with imshow and gridspec : How can I project this 2D histogram into a horizontal and a vertical histogram (or curves) so that it looks aligned, like the first image? import numpy as np import matplotlib.pyplot as plt import matplotlib.gridspec as gridspec

问题 I'm a complete R beginner, and am trying to do something pretty basic - make histograms of two vectors I imported from Excel. The vectors are xa and xb. I tried hist(xa), and get the following error: Error in hist.default(xa) : 'x' must be numeric So I did some searching, and tried to remedy this using as.numeric(xa), and got: Error: (list) object cannot be coerced to type 'double' So I tried the as.list function, but it turned my vector into a matrix. Not really sure what's going on. The

问题 I have a dataset that I'd like to plot with hist in R. There are a number of rows in the dataset whose values are beyond a value that I care about. Specifically, my R script is: library(ggplot2) data = read.table("input.txt", sep=" ", strip.white=TRUE, header=TRUE) pdf("out.pdf") hist(data$actions,breaks=seq(0,130,by=1)) dev.off() An example dataset for input.txt is: name actions foo 3 bar 129 baz 131 If I run the R script, I get an error: Error in hist.default(data$actions, breaks = seq(0,

问题 I have a numpy histogram that I would like to output as a tab-delimited text file. My code is below: targethist = np.histogram(targetlist, bins=ilist) print targethist np.savetxt('ChrI_dens.txt',targethist,delimiter='\t') targetlist and ilist are long lists of integers. I get the following output: (array([0, 0, 0, ..., 0, 0, 0]), array([ 1, 10000, 20000, ..., 15060000, 15070000, 15072422])) Traceback (most recent call last): File "target_dens_np.py", line 62, in np.savetxt('ChrI_dens.txt'

问题 I want to display some dates in the X axis of a histogram chart, but i don't understand how i can do it with this code i can create a simple histogram with couples of x-y values, but they can olny be numbers, not date: DefaultTableXYDataset dataset = new DefaultTableXYDataset(); XYSeries serie = new XYSeries("Andamento consumi", true, false); serie.add(30, 8.3); serie.add(31, 7.1); serie.add(1, 8.7); serie.add(2, 6.0); serie.add(3, 11.9); dataset.addSeries(serie); JFreeChart chart =