interpolation

Color scaling function

由 无人久伴 提交于 2019-11-28 06:01:01
I am trying to visualize some values on a form. They range from 0 to 200 and I would like the ones around 0 be green and turn bright red as they go to 200. Basically the function should return color based on the value inputted. Any ideas ? Basically, the general method for smooth transition between two values is the following function: function transition(value, maximum, start_point, end_point): return start_point + (end_point - start_point)*value/maximum That given, you define a function that does the transition for triplets (RGB, HSV etc). function transition3(value, maximum, (s1, s2, s3),

interpolate 3D volume with numpy and or scipy

由 匆匆过客 提交于 2019-11-28 05:27:06
I am extremely frustrated because after several hours I can't seem to be able to do a seemingly easy 3D interpolation in python. In Matlab all I had to do was Vi = interp3(x,y,z,V,xi,yi,zi) What is the exact equivalent of this using scipy's ndimage.map_coordinate or other numpy methods? Thanks In scipy 0.14 or later, there is a new function scipy.interpolate.RegularGridInterpolator which closely resembles interp3 . The MATLAB command Vi = interp3(x,y,z,V,xi,yi,zi) would translate to something like: from numpy import array from scipy.interpolate import RegularGridInterpolator as rgi my

Rotation Interpolation

由 浪子不回头ぞ 提交于 2019-11-28 04:58:23
NB: I'll present this question in degrees purely for simplicity, radians, degrees, different zero-bearing, the problem is essentially the same. Does anyone have any ideas on the code behind rotational interpolation? Given a linear interpolation function: Lerp(from, to, amount), where amount is 0...1 which returns a value between from and to, by amount. How could I apply this same function to a rotational interpolation between 0 and 360 degrees? Given that degrees should not be returned outside 0 and 360. Given this unit circle for degrees: where from = 45 and to = 315, the algorithm should

Fill multi-index Pandas DataFrame with interpolation

由 一世执手 提交于 2019-11-28 04:30:26
问题 I would like to bfill and ffill a multi-index DataFrame containing NaN s (in this case the ImpVol field) using the interpolate method. A section of the DataFrame might look like this: Expiration OptionType Strike ImpVol 2014-12-26 call 140.0 NaN 145.0 NaN 147.0 NaN 149.0 NaN 150.0 NaN 152.5 NaN 155.0 0.233631 157.5 0.206149 160.0 0.149118 162.5 0.110867 165.0 0.110047 167.5 NaN 170.0 NaN 172.5 NaN 175.0 NaN 177.5 NaN 180.0 NaN 187.5 NaN 192.5 NaN put 132.0 NaN 135.0 NaN 140.0 NaN 141.0 NaN

How do I make angular.js reevaluate / recompile inner html?

由 戏子无情 提交于 2019-11-28 04:29:43
I'm making a directive that modifies it's inner html. Code so far: .directive('autotranslate', function($interpolate) { return function(scope, element, attr) { var html = element.html(); debugger; html = html.replace(/\[\[(\w+)\]\]/g, function(_, text) { return '<span translate="' + text + '"></span>'; }); element.html(html); } }) It works, except that the inner html is not evaluated by angular. I want to trigger a revaluation of element 's subtree. Is there a way to do that? Thanks :) You have to $compile your inner html like .directive('autotranslate', function($interpolate, $compile) {

scattered data interpolation

由 拜拜、爱过 提交于 2019-11-28 04:27:17
问题 I have a set of data for example: X Y Z 1 3 7 2 5 8 1 4 9 3 6 10 I would like to interpolate Z for X=2.5 and Y=3.5 . How do i do it? I cannot use interp2 here because X and Y are not strictly monotonic (increasing or decreasing). 回答1: It seems like griddata is the function you are looking for: z = griddata( [1 2 1 3], [3 5 4 6], [7 8 9 10], 2.5, 3.5, 'nearest' ) 回答2: The currently preferred way to perform scattered data interpolation is via the scatteredInterpolant object class: >> F =

AngularJS strategy to prevent flash-of-unstyled-content for a class

由 ℡╲_俬逩灬. 提交于 2019-11-28 04:04:21
I have an AngularJS project, I want to prevent a FOUC during page load on a classname. I've read about ng-template but that seems useful only for content within a tag. <body class="{{ bodyClass }}"> I would like it to be "login" on page load. Any strategy for this? Or do I just have to fudge it and load it as 'login' and manually use javascript to to tweak the DOM just for this instance. What you are looking for is ng-cloak . You have to add it like this: <body class="{{ bodyClass }}" ng-cloak> and this will prevent unwanted flashing. Link to docs about this. Edit: It is also advisable to put

Piecewise linear integer curve interpolation in C#/Unity3D

由 风格不统一 提交于 2019-11-28 02:17:47
Is there a simple, efficient way to implement a piecewise linear integer-to-integer curve interpolation in C# (for Unity3D, if it matters) ? Details are as follows: The piecewise linear curve representation has to be built over time. The first interpolation request comes before we have all data points The curve is strictly monotonous The first point is always (0, 0) The data points' first coordinates are also strictly monotonous w.r.t arrival time, i.e. the points are naturally ordered by their first coordinate. The data points are not in ranges that would cause cause overflow problems for 4

Fastest way to get all the points between two (X,Y) coordinates in python

由 血红的双手。 提交于 2019-11-28 02:05:45
问题 So I have a shapely LineString : print np.round(shapely_intersecting_lines.coords).astype(np.int) >>> array([[ 1520, -1140], [ 1412, -973]]) This can be interpreted as a numpy array as well as seen above. I want to get all the points in between, that is I want to get the points of the line in between as integer values. The output should be something like this: array([[ 1520, -1140], [ 1519, -1139], [ 1519, -1138], ..., [ 1413, -975], [ 1412, -974], [ 1412, -973]], dtype=int32) I posted this

Bitwise Operations— How to change existing color?

由 安稳与你 提交于 2019-11-28 01:59:48
问题 I have read up on bitwise operators (& | ^) and I understand that if I were to do: alpha = 0xFF000000 >> 24 ; blue = 0xFF0000FF & 0x000000FF; red = 0xFFFF0000>>16 & 0x000000FF; green = 0xFF00FF00>>8 & 0x000000FF; then I can mask the other colors and just have red or blue(etc...) components and if I were to do int color = alpha | blue | red | green; then I re-construct the color again so to speak. What I am curious about is what if I wanted to create a bilinear interpolation between two colors
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