undefined

问题 i have been trying generate an image. C1 = imread(InputImage); NumberOfGrayLevels=32; I= 0.299*C1(:,:,1)+0.587*C1(:,:,2)+0.114*C1(:,:,3); C = 0; I=(C*log(I+1))'; new=uint8(mat2gray(I)*(NumberOfGrayLevels-1)); [m,n]= size(new); rgb = zeros(m,n,3); rgb(:,:,1) = new; rgb(:,:,2) = rgb(:,:,1); rgb(:,:,3) = rgb(:,:,2); new = rgb/256; imshow(new,[]); no9=figure; image(new); the error is showing at I=(C*log(I+1))';..can you tell me how to solve this? 回答1: Most probably C1 is of type uint8 . You

问题 I am trying to use react-native-image-picker, but stuck here, it always shows the error as on the below photo: undefined is not an object(evaluating 'ImagePickerManager.showImagePicker') Is there anyone who had this problem? 回答1: I had met it too. After a few hours, I find a solution to it. Install $npm install react-native-image-picker@latest --save Automatic Installation React Native >= 0.29 $react-native link React Native < 0.29 $rnpm link https://github.com/marcshilling/react-native-image

问题 I'm trying to send an email through Laravel, but I'm getting this error: Undefined variable: contactEmail Even though it got defined above it. What is going wrong here? Controller $contactName = Input::get('name'); $contactEmail = Input::get('email'); $contactMessage = Input::get('message'); $data = array('name'=>$contactName, 'email'=>$contactEmail, 'message'=>$contactMessage); Mail::send('template.mail', $data, function($message) { $message->from($contactEmail, $contactName); $message->to(

问题 Forehand I'd like to mention I'm fairly new to C++ programming and that I'm using Ogre3D as framework (for school project reasons). I have a class Player which inherits from the GameObject class. When trying to build the project I'm confronted with the following error: Error C2504 'GameObject' : base class undefined - player.h (9) Which would imply the GameObject class is undefined within the player class' header file. However I have in fact included the GameObject header file in that of the

问题 I've taken this example from a similar question here: Iterating over a JSON object (NOT an array) in C# But my data format is a little different, it has array brackets. As pointed out I can have an undefined number of entries, I want to walk through the entries and extract the data structure into an array/list of objects based on the class defined. { "-KeArK3V02mXYWx2OMWh" : [{ "Description" : "this is a description", "Location" : "Atlanta", "Name" : "Event One", "Time" : "2017-03-01T21:53:12

问题 Originally I had :committed days working beautifully, but upon changing up the models a bit in order to accommodate the User's ability to check off if he missed a :committed day I now get an error message for the code relating to :committed : undefined method to_date for nil:NilClass Line #30 n_days = ((date_started.to_date)..Date.today).count { |date| committed_wdays.include? date.wday } This code comes from the habit model: class Habit < ActiveRecord::Base belongs_to :user has_many :levels

问题 I'm trying to build a source code and after passing/fixing a ton of errors, I'm stuck at a point where I have no idea how to fix. I'm novice in building sources but I tried to search for this error and none of them worked me although I'm not sure if I implemented them correctly. I'm on OSX 10.8.5 with XCode 5.1.1 I'm striving to make a cmake file but at 75% I'm getting this error (brief form): Undefined symbols for architecture x86_64: "_glBegin", referenced from: AlembicHolderOverride::draw

问题 I understand from MDN that 'undefined' is recognised as a primitive value, which is corroborated by the ES doco also stating that an "undefined value" is a "primitive value used when a variable has not been assigned a value ". I also understand even though the variable may not be assigned a value (i.e. an uninitialised variable), memory is still allocated for it during the creation of its execution context ('creation' phase) prior to execution happening. This explains why when we attempt to

问题 This question already has answers here : “Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP (28 answers) Closed 3 years ago . not sure if I have a unique problem or just haven't been able to hit the right terms on google to find it, but my problem is dealing with an undefined variable and not being able to check it. Across my site for menus I include a php file with all the menu stuff in it, then echo out the various parts as needed. My problem

问题 I have written a function which sends a GET request and returns the response. this.generateToken = function() { var options = { uri: 'http://localhost:10000/token', method: 'GET', headers: { 'Authorization': "YWRtaW46YWRtaW4=" }, }; request(options, function (error, response, body) { var messageresponse = response.body.toString(); console.log(messageresponse); //I am able to print the response return messageresponse; }); }; I am able to print the value of 'messageresponse' variable inside