histogram

问题 I have a dataset with 3-hourly precipitation amounts for the month of January in the period 1977-1983 (see attachment). However, I want to generate precipitation data for the period 1984-1990 based upon these data. Therefore, I was wondering if it would be possible to create a custom made probability density function of the precipitation amounts (1977-1983) and from this, generate random numbers (precipitation data) for the desired period (1984-1990). Is this possible in Matlab and could

问题 I need to plot a weighted histogram of density rather than frequency. I know that freq = FALSE is available in hist() but you can't specify weights. In ggplot2 I can do this: library(ggplot2) w <- seq(1,1000) w <-w/sum(w) v <- sort(runif(1000)) foo <- data.frame(v, w) ggplot(foo, aes(v, weight = w)) + geom_histogram() But where is the equivalent of freq = FALSE ? 回答1: By default, geom_histogram() will use frequency rather than density on the y-axis. However, you can change this by setting

问题 I have a pre-binned frequency table for a rather large dataset. That is, a single column vector of bins and a single column vector of counts associated with those bins. I'd like R to plot a histogram of this data by doing further binning and summing the existing counts. For example, if in the pre-binned data I have something like [(0.01, 5000), (0.02, 231), (0.03, 948)], where the first number is the bin and the second is the count, and I choose 0.04 as the new bin width, I'd expect to get [

问题 I have a pre-binned frequency table for a rather large dataset. That is, a single column vector of bins and a single column vector of counts associated with those bins. I'd like R to plot a histogram of this data by doing further binning and summing the existing counts. For example, if in the pre-binned data I have something like [(0.01, 5000), (0.02, 231), (0.03, 948)], where the first number is the bin and the second is the count, and I choose 0.04 as the new bin width, I'd expect to get [

问题 I 'm having a problem with creating a joint density function from data. What I have is queue sizes from a stock as two vectors saved as: X = [askQueueSize bidQueueSize]; I then use the hist3-function to create a 3D histogram. This is what I get: http://dl.dropbox.com/u/709705/hist-plot.png What I want is to have the Z-axis normalized so that it goes from [0 1]. How do I do that? Or do someone have a great joint density matlab function on stock? This is similar (How to draw probability density

问题 I want to create a histogram from a number of observations (i.e. d <- c(1,2.1,3.4,4.5) ) and then highlight the bin that a particular observation falls in, such that I have an output that looks like this: how do I do this in R? 回答1: Expanding on dangerstat's answer, here is a little function that will automatically find which bin contains the value that you want to highlight: highlight <- function(x, value, col.value, col=NA, ...){ hst <- hist(x, ...) idx <- findInterval(value, hst$breaks)

问题 i want to show image RGB colour histogram in cocoa application. Please suggest possible way to do it with objective c or any third party library available to achieve this. 回答1: well this is a problem as RGB colors are 3D space so their histogram would lead to 4D plot which is something we do not really comprehend. So the solution to this is to convert the 4D plot to 3D plot somehow. This can be done by sorting the colors by something that has some meaning. I will not speculate and describe

问题 I like to make a histogram. With drawLine() , it's not really a problem for me, but when I try to do it with fillRect() the rectangles are going from top to bottom. I would like to paint the histogram looking similar to my histogram with drawLine() . Here is my code: public void paint(Graphics g) { super.paint(g); int height = getHeight(); int width = getWidth(); int x =10; haufigkeit=model.getMap(); for(int i = 1; i <= 45; i++) { int y; y = haufigkeit.get(i); Color color = new Color(0, 0,

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: how to convert numbers into symbols in java? for example instead of 2 to **, or 3 to *** etc. How can I convert numbers into a histogram ? The histogram should display the bar graphs from 2-12 based upon how many times that value was rolled. currently my output is like the second pic but is suppose to look like the first one. thanks. public static void main(String[] args) { // TODO code application logic here

问题 I am trying to split an image using image slicer in python and then apply histogram equalization on each of them and combine them back. I am able to split the images into smaller blocks and I can see them being updated but after stitching them together I end up with the same image as the original one. Can someone point out what I am doing wrong. The file name is watch.png import cv2 import numpy as np from matplotlib import pyplot as plt from scipy.misc import imsave # import scipy from scipy