filtering

问题 This question already has answers here : Filter multiple values on a string column in dplyr (4 answers) Closed 7 days ago . I would like to filter values based on one column with multiple values. For example, one data.frame has s&p 500 tickers, i have to pick 20 of them and associated closing prices. How to do it? 回答1: If I understand well you question, I believe you should do it with dplyr : library(dplyr) target <- c("Ticker1", "Ticker2", "Ticker3") filter(df, Ticker %in% target) The answer

问题 I'm using ffmpeg.exe -i in.jpg -filter_complex "[0:v]pad=iw:ih+10:0:0" out.jpg to add a padding of 10px at the bottom of images and videos. In most cases it works as expected but with some the width is off by 1px resulting in failure with error: [Parsed_pad_0 @ 000002ba70617c40] Input area 0:0:623:640 not within the padded area 0:0:622:650 or zero-sized [Parsed_pad_0 @ 000002ba70617c40] Failed to configure input pad on Parsed_pad_0 Error reinitializing filters! Failed to inject frame into

问题 I'm using ffmpeg.exe -i in.jpg -filter_complex "[0:v]pad=iw:ih+10:0:0" out.jpg to add a padding of 10px at the bottom of images and videos. In most cases it works as expected but with some the width is off by 1px resulting in failure with error: [Parsed_pad_0 @ 000002ba70617c40] Input area 0:0:623:640 not within the padded area 0:0:622:650 or zero-sized [Parsed_pad_0 @ 000002ba70617c40] Failed to configure input pad on Parsed_pad_0 Error reinitializing filters! Failed to inject frame into

问题 I have two problems: First is... I have one dataframe with category and keywords like this: Category Keywords 0 Fruit ['apple', 'pear', 'plum', 'grape'] 1 Color ['red', 'purple', 'green'] Another dataframe like this: Summary 0 This is a basket of red apples. They are sour. 1 We found a bushel of fruit. They are red. 2 There is a peck of pears that taste sweet. 3 We have a box of plums. I want the end result like this: Category Summary 0 Fruit, Color This is a basket of red apples. They are

问题 I have two problems: First is... I have one dataframe with category and keywords like this: Category Keywords 0 Fruit ['apple', 'pear', 'plum', 'grape'] 1 Color ['red', 'purple', 'green'] Another dataframe like this: Summary 0 This is a basket of red apples. They are sour. 1 We found a bushel of fruit. They are red. 2 There is a peck of pears that taste sweet. 3 We have a box of plums. I want the end result like this: Category Summary 0 Fruit, Color This is a basket of red apples. They are

问题 I am struggling attempting to create a program that pads an image and filter/mask. Where I am having trouble is actually attempting to move this filter over each bit of the image without using a function to do so. Here is what I have so far. L=256; %Gray Levels %Saving Dimensions of both Filter and Image Sizes [FilterX , FilterY] = size(Filter); [ImageX , ImageY]= size(Image); % Padding Image pad1 = FilterY; PAD = (pad1-1); %New Padded Image With Zeros MaskX = ImageX + PAD; MaskY = ImageY +

问题 New to Coding & VBA and this is my first attempt at trying to Select and Copy the 1st 10 rows of visible data together with the table Header in a Table that I have filtered using VBA Macro. I used examples of code in this link on stackoverflow. VBA selecting visible cells after filtering. This particular example allows me to learn how to copy the values in a single column. I would like to copy the values for the entire Row, or some of the columns depending on which is easier. Sub LPRDATA()

问题 I have a question regarding filtering using the dplyr package in R . I have a current dataframe as follows: url season salary <fct> <fct> <dbl> 1 /players/a/abrinal01.html 2016-17 5725000 2 /players/a/ackeral01.html 2008-09 711517 3 /players/a/acyqu01.html 2012-13 788872 4 /players/a/acyqu01.html 2013-14 915243 5 /players/a/acyqu01.html 2014-15 981348 6 /players/a/acyqu01.html 2015-16 1914544 7 /players/a/acyqu01.html 2016-17 1709538 8 /players/a/adamsjo01.html 2014-15 1404600 9 /players/a

问题 I'm trying to do 2d wavelet filtering in python. I found out about PyWavelets and I have been messing around with it for awhile. I am trying to do the transformation for 4 levels. When I print it out it gives werid output and I'm not sure exactly what is going on. I've tried a few things but this is the latest as an example: test = pywt.dwt2(picture,'db1') Any help on preforming 2d wavelets on images with PyWavelets or just in general would be much appreciated. Thank you. Edit: The type of

问题 I need some help in converting a hex string into an image doing some researches i came up to this code: private byte[] HexString2Bytes(string hexString) { int bytesCount = (hexString.Length) / 2; byte[] bytes = new byte[bytesCount]; for (int x = 0; x < bytesCount; ++x) { bytes[x] = Convert.ToByte(hexString.Substring(x*2, 2),16); } return bytes; } public bool ByteArrayToFile(string _FileName, byte[] _ByteArray) { try { System.IO.FileStream _FileStream = new System.IO.FileStream(_FileName,