contour

Contour plot legend - Matplotlib

由 ℡╲_俬逩灬. 提交于 2019-12-08 06:42:22
问题 As the question says, I have a contour plot and I would like show a legend for if. I'm using the contour plot style that uses: dashed lines for negative levels solid lines for positive values I would like to have a legend for them (dashed == negative and solid == positive). I tried the approaches found here and here. However, as can be seen below, this doesn't show the correct result. # Draw the scalar field level curves div_field = plt.contour(x, y, div_scalar_field, colors='white') rot

contour plot with date-time strings as x values

由 三世轮回 提交于 2019-12-08 02:53:30
问题 I am trying to produce a color contour plot showing time along the x axis, depth along the y and temperature as the z values. Time is given as: "2011-01-01 00:01" i.e. "%Y-%m-%d %H:%M" Is there a method for producing the color contour plot from these, and using filled.contour(Time,Depth,temp) example: time <- c("2011-01-01 01:00", "2011-01-01 02:00", "2011-01-01 03:00", "2011-01-01 04:00") depth <- seq(1,10,by = 1) seq1 <- seq(1:40) temp <- matrix(seq1, 10) Every column of temp represents a

How to draw a rectangle around the contours?

由 大兔子大兔子 提交于 2019-12-08 02:47:34
问题 I am just starting out with opencv and I am trying to make a program that puts squares around a picture of rocks on some sand. The documentation for the function here includes an example of how to use it. findContours( src, contours, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE ); The prototype of findContours is void findContours(InputOutputArray image, OutputArrayOfArrays contours, OutputArray hierarchy, int mode, int method, Point offset=Point()) ; I have two questions. 1. The third

(opencv) merge contours together

由 假如想象 提交于 2019-12-07 13:00:10
问题 I am doing a real time motion detection program. I find that there are a lot of contour made in my different image after i used background subtraction method . i would like to ask is there any method that can merge these contour together or make a larger rect contain all the contours? the case now i have been done http://singhgaganpreet.files.wordpress.com/2012/07/motioncolour.jpg My code is here #include <iostream> #include <OpenCV/cv.h> #include <OPenCV/highgui.h> using namespace cv; using

Contour plot from scattered data in JavaScript [closed]

由 拥有回忆 提交于 2019-12-07 12:21:01
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I'm trying to plot a 2D and 3D contour from x, y, z data. Does anyone know any good JavaScript library that does that? Thank you 回答1: This question is very similar to another question that was already asked and answered at Create contour map In that post, it was recommended to use d3.js and conrec.js. 来源： https:

Set limits on a matplotlib colorbar without changing the actual plot

由 霸气de小男生 提交于 2019-12-07 07:28:57
问题 I would like create a pseudocolor plot (e.g. contour or contourf ) and a colorbar. For practical reason, I want the range of the colorbar different from the underlying mappable. In the example below, the data Z has a range from 0 to 10000, which is mapped to a colormap. The range of the colorbar is the same. import numpy from matplotlib import pyplot X = numpy.arange(100) Y = numpy.arange(100) Z = numpy.arange(100**2).reshape((100,100)) f = pyplot.figure() ax = f.gca() cf = ax.contourf(X,Y,Z

gnuplot contour plot hatched lines

由 ＊爱你＆永不变心＊ 提交于 2019-12-07 03:13:31
问题 I'm using gnuplot for contour plot of a several function. This is for optimization problem. I have 3 functions: f(x,y) g1(x,y) g2(x,y) both g1(x,y) and g2(x,y) are constraints and would like to plot on top of the contour plot of f(x,y) . Here is the textbook example: Here is my attempt to replicate it in gnuplot, thanks to @theozh. ### contour lines with labels reset session f(x,y)=(x**2+y-11)**2+(x+y**2-7)**2 g1(x,y)=(x-5)**2+y**2 g2(x,y) = 4*x+y set xrange [0:6] set yrange [0:6] set

find iso-cost points on a 3d grid efficiently with minimum costing of points

由 强颜欢笑 提交于 2019-12-07 02:28:17
问题 I have a 3d grid where in each point (x,y,z) on the grid is associated with a cost value. The cost of any point (x,y,z) is not known in advance . To know the cost, we need to make a complex query which is really expensive. One thing we know about the object is that cost is monotonically non-decreasing in all 3 dimensions . Now given a cost C, I need to find the points (x,y,z) on the surface which have cost C . This has to be done by costing only bare minimum . How to solve my problem? When I

Matplotlib: Multiple legends for contour plot for multiple contour variables

由 有些话、适合烂在心里 提交于 2019-12-07 01:34:25
I need to make multiple contours plots of several variables on the same page. I can do this with MATLAB (see below for MATLAB code). I cannot get matplotlib to show multiple legends. Any help would be much appreciated. Python code: import numpy as np from matplotlib import cm as cm from matplotlib import pyplot as plt delta = 0.25 x = np.arange(-3.0, 3.0, delta) y = np.arange(-2.0, 2.0, delta) X, Y = np.meshgrid(x, y) Z1 = X*np.exp(-X**2-Y**2) Z2 = Y*np.exp(-X**2-Y**2) plt.figure() CS = plt.contour(X, Y, Z1, colors='k') plt.clabel(CS, inline=1, fontsize=10) CS = plt.contour(X, Y, Z2, colors='r

Draw heat map (or similar) of 2D population distribution

由 老子叫甜甜 提交于 2019-12-06 16:44:33
I am wondering how I can draw an image of the population proportion (pop.prop) at these locations (x and y) so that I can see the population distribution clearly? The data is shown below: pts.pr = pts.cent[pts.cent$PIDS==3, ] pop = rnorm(nrow(pts.pr), 0, 1) pop.prop = exp(pop)/sum(exp(pop)) pts.pr.data = as.data.frame(cbind(pts.pr@coords, cbind(pop.prop))) x y pop.prop 3633 106.3077 38.90931 0.070022855 3634 106.8077 38.90931 0.012173106 3756 106.3077 38.40931 0.039693085 3878 105.8077 37.90931 0.034190747 3879 106.3077 37.90931 0.057981214 3880 106.8077 37.90931 0.089484103 3881 107.3077 37
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