interpolation

When i use the following code and have nameTextField be "Jeffrey" (or any other name) @IBAction func helloWorldAction(nameTextField: UITextField) { nameLabel.text = "Hello, \(nameTextField.text)" } nameLabel displays... Hello, Optional("Jeffrey") But, when I change the previous code to include a "!" like this: @IBAction func helloWorldAction(nameTextField: UITextField) { nameLabel.text = "Hello, \(nameTextField.text!)" } The code works as expected and nameLabel displays.... Hello, Jeffrey Why is the "!" required, in the video tutorial I used to create this simple program he did not use the "!"

In Ruby you can reference variables inside strings and they are interpolated at runtime. For example if you declare a variable foo equals "Ted" and you declare a string "Hello, #{foo}" it interpolates to "Hello, Ted" . I've not been able to figure out how to perform the magic "#{}" interpolation on data read from a file. In pseudo code it might look something like this: interpolated_string = File.new('myfile.txt').read.interpolate But that last interpolate method doesn't exist. stesch Instead of interpolating, you could use erb . This blog gives simple example of ERB usage, require 'erb' name

How do I resample a time series in pandas to a weekly frequency where the weeks start on an arbitrary day? I see that there's an optional keyword base but it only works for intervals shorter than a day. Andy Hayden You can pass anchored offsets to resample , among other options they cover this case. For example the weekly frequency from Monday: ts.resample('W-MON') You will be much safer with resampling based on days and then slicing every 7th day, e.g: ts.resample('D').interpolate()[::7] See the underlying problem with other approaches in this open pandas issue on github: https://github.com

I am trying to create a mixin that dynamically defines variables in LESS CSS, by actually assigning them a composite name. The simplified use-case (not the real one): .define(@var){ @foo{var}: 0; } Then one would call the mixin as such: .define('Bar'){ @fooBar: 0; } Since this kind of string interpolation is possible while using selectors names, I was wondering if the same would be possible for variable names; so far, I have had no luck with various syntaxes I tried (other than the above, I tried escaping, quoting, using the ~ prefix and so on). Edit I just tried one more thing, and I feel I

I'm trying to write a method that interpolates from 0 to x (position of an object in one dimension) over time using acceleration at the beginning and deceleration at the end (ease out / ease in) with the only constraints that the total time is provided , as well as the duration of the acceleration and deceleration . the motion should replicate the inertia effect and I'm considering a Hermite curve for the non-linear portions. double Interpolate( double timeToAccel, double timeCruising, double timeToDecel, double finalPosition, double currentTime) { //... } Can someone point me out to a portion

Currently, I'm attempting to make multiple beziers have equidistant points. I'm currently using cubic interpolation to find the points, but because the way beziers work some areas are more dense than others and proving gross for texture mapping because of the variable distance. Is there a way to find points on a bezier by distance rather than by percentage? Furthermore, is it possible to extend this to multiple connected curves? distance between P_0 and P_3 (in cubic form), yes, but I think you knew that, is straight forward. Distance on a curve is just arc length: fig 1 http://www.codecogs

Previous Posts Cleaning up a map using geom_tile Get boundaries to come through on states Problem/Question I'm trying to smooth out some data to map with ggplot2. Thanks to @MrFlick and @hrbrmstr, I've made a lot of progress, but am having problems getting a "gradient" effect over the states I need listed. Here is an example to give you an idea about what I'm looking for : **** This is exactly what I'm trying to achieve. http://nrelscience.org/2013/05/30/this-is-how-i-did-it-mapping-in-r-with-ggplot2/ (1) How can I make the most of ggplot2 with my data? (2) Is there a better method for

I want to retrieve the rgb of a pixel in the image. But the location is not integer location but real values (x,y). I want a bilinear interpolated value. How could I do it opencv? Thanks a lot There is no simple function for subpixel access but I can suggest you few options: Use getRectSubPix and extract 1 pixel region: cv::Vec3b getColorSubpix(const cv::Mat& img, cv::Point2f pt) { cv::Mat patch; cv::getRectSubPix(img, cv::Size(1,1), pt, patch); return patch.at<cv::Vec3b>(0,0); } Use more flexible but less precise remap with one-pixel map: cv::Vec3b getColorSubpix(const cv::Mat& img, cv: