no-match | 易学教程

Properties of pmatch function

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问题 I don't understand the behavior of the built-in function pmatch (partial string matching). The description provides the following example: pmatch("m", c("mean", "median", "mode")) # returns NA instead of 1,2,3 but using: pmatch("m", "mean") # returns 1, as I would have expected. Could anybody explain to me this behavior? 回答1: As per the documentation: nomatch : the value to be returned at non-matching or multiply partially matching positions. Note that it is coerced to integer. The nomatch

Properties of pmatch function

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csh set: no match error wildcard

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问题 trying to look up files in directories with wildcard *, and put the names into an array the files have similar names (MATCHr1, MATCHr2 ... ) the problem arises when the file does not exist (which is a possibility) set command returns a "no match" error and terminates the loop if this happens how can i get it handle the error by jumping to the next iteration? set SUBIDS = (10003 10005 10006) foreach SUBID ($SUBIDS) foreach SEQR ( MATCH ENC NBACK SIMON FACE ) ls -l *${SEQR}*.nii.gz set Array =

openCV no matching function fillPoly

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问题 I am trying to implement this answer, but I am getting always error. Please help. My code: cv::Point corners[1][6]; for (unsigned long j = startIndex; j < startIndex+6; j++) { int x = shape.part(j).x(); int y = shape.part(j).y(); corners[0][j-startIndex] = Point(x, y); } const Point* corner_list[1] = {corners[0]}; cv::Mat mask(image.rows, image.cols, CV_8UC2); cv::fillPoly(mask, corner_list, 6, 1, cv::Scalar(255), 8); cv::Mat result(image.size(), image.type(), cv::Scalar(0,0,0)); image.copyTo

React Router v4 global no match to nested route childs

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问题 How can I redirect the user to a NoMatch component when I have nested routes in React Router V4? Here is my code: import React from 'react'; import ReactDOM from 'react-dom'; import injectTapEventPlugin from 'react-tap-event-plugin'; injectTapEventPlugin(); import { BrowserRouter as Router, Route, Switch } from 'react-router-dom'; import Website from './website/Website'; const Register = ({ match}) => { return ( <div> <Route exact path={match.url} render={() => {return <h1>Register</h1>} } />

error: no match for 'operator>>' in 'std::cin >> stopat'

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问题 I'm trying to get back into C++, and this is my second program in a long while. Everything compiles just peachy, until it gets to cin >> stopat; where it returns what seems to be a fairly common error: error: no match for 'operator>>' in 'std::cin >> stopat' I've looked through a few things explaining what causes this, but nothing I actually understand (due to my relative inexperience in programming). What causes this error, and how do I fix it in case I come across it again? #include

error: no match for operator ==

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问题 I'm receiving an error for multiple areas of my three files. (I'm also having problems with my default constructor, which is why it is commented out. But I want to solve this problem first) // ComputerType.h //************************************************************************ // This file gives the specification of a ComputerType abstract data type //************************************************************************ // #ifndef COMPUTERTYPE_H // #define COMPUTERTYPE_H #include

error: no match for operator ==

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I'm receiving an error for multiple areas of my three files. (I'm also having problems with my default constructor, which is why it is commented out. But I want to solve this problem first) // ComputerType.h //************************************************************************ // This file gives the specification of a ComputerType abstract data type //************************************************************************ // #ifndef COMPUTERTYPE_H // #define COMPUTERTYPE_H #include<fstream> #include<iostream> #include<iomanip> #include<string> #include<cctype> using namespace std; class