interpolation

问题 I wonder if there is something like eps to represent the value of machine precision in C++? Can I use it as the smallest positive number that a double can represent? Is it possible to use 1.0/eps as the max positive number that a double can represent? Where can I find eps in both C++ and C standard libraries? Thanks and regards! UPDATE: For my purpose, I would like to compute a weight as reciprocal of a distance for something like inverse distance weighting interpolation (http://en.wikipedia

问题 Below is some part of my data. The 1st column R is the value I got from the experiment, and X Y Z are the coordinates. I am trying to use matlab n-D interpolation function. Matlab said my coordinates are not monotonic increased value. But I cant change or rearrange my coordinates. Did I use the wrong function? Please tell me what should I do. R X Y Z 5.05256e-18 0.016 0.015 0.032 4.99958e-18 0.016 0.015 0.064 5.04485e-18 0.016 0.015 0.128 5.49613e-18 0.016 0.0195 0.032 5.45348e-18 0.016 0

问题 How to custom Jackson to deserialize a value that contains a ${token} ? Here is an example of the functionnality that i want to add from the Apache Commons Configuration variable interpolation : { "file" = "${sys:user.home}/path/to/my_file" } 回答1: You can register a custom string deserialiser based on the default which would interpolate the variables after the deserialisation. But, as was pointed out in the comments, that would not work for the non-String types such as File and URLs. The

问题 Suppose if you are given a bunch of points in (x,y) values and you need to generate points by linearly interpolate between the 2 nearest values in the x axis, what is the fastest implementation to do so? I searched around but I was unable to find a satisfactory answer, I feel its because I wasnt searching for the right words. For example, if I was given (0,0) (0.5 , 1) (1, 0.5), then I want to get a value at 0.7; it would be (0.7-0.5)/(1-0.5) * (0.5-1) + 1; but what data structure would allow

问题 This is my use case: I have a web page with a responsive design. The page is vertically split in two halves, on the right hand side I want to show an image (a PDF page rendered as PNG or JPG). The size of the image should change as soon as the window is resized. I thought I already solved this. I render the image on the server to be big enough for the biggest possible window size (according to our company setup). Chrome and Firefox scale down (and interpolate) the image just fine. But then

问题 I know this subject was brought up a few times on stack overflow, however I'm still stumbling upon an interpolation problem. I have a complex dataframe of a set of columns, which could look something like this if simplified: df_new = pd.DataFrame(np.random.randn(5,7), columns=[402.3, 407.2, 412.3, 415.8, 419.9, 423.5, 428.3]) wl = np.array([400.0, 408.2, 412.5, 417.2, 420.5, 423.3, 425.0]) So what I need to do is to interpolate column-wise, to the new assigned values of cols (wl), for each

问题 Consider this D3JS graph which uses a basis interpolation: In D3JS v3, I could use bundle interpolation ( .interpolate("bundle").tension(0) ) on areas to achieve this type of rendering instead: Notice how each segment of the graph fits nicely with its neighbors. This is what I need. With D3JS v4 and v5, the syntax for bundle interpolation is now this: .curve(d3.curveBundle) . However, it's now "intended to work with d3.line, not d3.area." I recently upgraded from v3 to v5, and so I'm trying

问题 I'm creating some icon font rules for using in my site. Using Sass I wanted to list all the icons in a list variable and use @each to loop through them all. Code looks like this: $icons: wifi 600, wifi-hotspot 601, weather 602; @each $icon in $icons { .icon-#{nth($icon, 1)}, %icon-#{nth($icon, 1)} { content: "\#{nth($icon, 2)}"; } } The problem is the backslash on the content: line. I need it for the character encoding, but it escapes the variable interpolation, outputting CSS that looks like

问题 I need a series of classes, .module1, .module2, ... module(n). I also want to define those classes using css, ruby and HAML: :css .mod1 { background-image: url("#{extra.image}"); } Is it possible to interpolate ruby variables to save work? .module.mod"#{extra.id}" %h3 #{extra.title} %p #{extra.description} %a.btn-default{:href => "#", :target => "_top"} enter now :css .mod#{extra.id} { background-image: url("#{extra.image}"); } 回答1: According to the HAML_REFERENCE I used this method: - flavor

问题 I have a validates inclusion: in my model, but I think the default error message of "is not included in the list" is entirely unuseful. How do I make it show the list of allowed options in the error message itself? (for example, "is not one of the allowed options (option 1, option 2, or option 3)" ? More concretely, what is the most elegant way to get the following tests to pass: describe Person do describe 'validation' do describe 'highest_degree' do # Note: Uses matchers from shoulda gem it