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Anonymous Function with changing array size


Anonymous Function with changing array size

By : user2955933
Date : November 22 2020, 10:48 AM
may help you . The value of x is "hardwired" into the anonymous function when you create it. The function internally stores the value that x has at that time, and will always use that. Subsequent changes to x have no effect on the function. See this example from the documentation:
code :
>> x = [1 2 3 4];
>> fnc = @(i) (-100 * (x(i) - cos(h * t(i))) - sin(h * t(i)));
>> f = functions(fnc)
f = 
     function: '@(i)(-100*(x(i)-cos(h*t(i)))-sin(h*t(i)))'
         type: 'anonymous'
         file: ''
    workspace: {[1x1 struct]}
>> f.workspace{1}
ans = 
    x: [1 2 3 4]
fnc = @(i,x) (-100 * (x(i) - cos(h * t(i))) - sin(h * t(i)));


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Size of char array is changing while passing to a function in C

Size of char array is changing while passing to a function in C


By : Michael Hernandez Sa
Date : March 29 2020, 07:55 AM
Any of those help When you pass an array to the function it decays as the pointer to its first element.
When you apply sizeof inside the function on the receiving parameter you get the size of the pointer(in that environment) and not the size of array.
Changing/Getting variable in anonymous function

Changing/Getting variable in anonymous function


By : Praveen Murugesan
Date : March 29 2020, 07:55 AM
Does that help .query appears to be asynchronous, which means that it probably executes after return state; is executed. What you need to do is provide a callback argument to registerUser:
code :
function register_user(username, password, callback) {        

    if (!username) { //line #4
        callback('Missing <strong>username</strong>');                
    }

    if (!password) { //line #8
        callback('Missing <strong>password</strong>');
    }

    function addUser() {
            statement = 'INSERT INTO data (user_name, user_password) VALUES (\'' + username + '\', \'' + password + '\');';
            connection.query(statement, function(err) {
                    if (err) throw err;
                    console.log('User ' + username + ' added to database');
            })
    }

    connection.query('SELECT user_name FROM data WHERE user_name=\'' + username + '\'', function(err, result){
            if (err) throw err;
            if (!result[0]) {
                    addUser();
                    console.log('User ' + username + ' added.');
                    callback('Success!');

            } else {
                    console.log('User ' + username + ' already exists.');
                    callback('User already exists!');

            }
    })
}
registerUser(username, password, function(state) {
    console.log("Message was:", state);
});
Changing the size of a global array in the main function

Changing the size of a global array in the main function


By : user3591151
Date : March 29 2020, 07:55 AM
hop of those help? What you have there is static allocation and the memory is allocated on stack (actually not really on stack, since these are global variables - see the comments). It means that the size of the array needs to be known at compile time. On the other hand, you want to be able to allocate memory at run time since you don't know the size (NumOfNames) earlier. That is called dynamic allocation and you need malloc (or calloc,...) for that. Such memory is allocated on heap. For more information on this please read e.g. these:
Difference between static memory allocation and dynamic memory allocation What and where are the stack and heap?
code :
struct Node
{
    int Line;
    struct Node *Next;
} ;

struct Node** Heads;
struct Node** Currs; 

int NumOfNames;

int main() {
    // ...
    NumOfNames = 42;
    Heads = malloc(NumOfNames * sizeof(struct Node*));
    Currs = malloc(NumOfNames * sizeof(struct Node*));

    // if you want to allocate the Nodes too...
    int i;
    for (i = 0; i < NumOfNames; i++) {
        Heads[i] = malloc(sizeof(struct Node));
        Currs[i] = malloc(sizeof(struct Node));
    }
    // ...
}
How to add extra parameter when changing anonymous function to named function

How to add extra parameter when changing anonymous function to named function


By : varsha nb
Date : March 29 2020, 07:55 AM
Any of those help I have a situation like this:
Why Size of Structure Array Changing When Passing to a function?

Why Size of Structure Array Changing When Passing to a function?


By : Derek
Date : March 29 2020, 07:55 AM
Hope that helps You pass a pointer to a structure to the function. And you get the size of the pointer and not the data it points to.
If you pass an array to a function, you always need to pass the number of elements in the array to the function as a separate argument.
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