I have searched what is available already and cannot seem to find exact answers. I think I have figured the first part but still wanted to check with someone. However the questions have me so confused :(Conch Republic Electronics Chapter Case

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

I have several functions to complete on a data set in R

1. Load the dataset mtcars.xlsx- completed.

Preview the document into memory and convert column am to a factor using factor() function.

2. Split the data into training set and test set. The training set contains the first 35 observations, the test set containing the remaining observations.

3. Build a logistic regression model with the response is am and the predictors are mpg, cyl, hp, and wt using glm() function

4. Compute the test error on the test data set using a confusion matrix. Is it a good model based on test error?

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

I have solved it but I just need someone to check it for me.

The solved problem is attached. 

Use least-squares approximation to find the best linear fit (i.e., the best line)

y = Ct + D

to the following data points:

(t1, y1)=(-3, -4)

(t2, y2) = (0, -7)

(t3, y3) = (3, -16).

What are the values of C and D that define this line?

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Hi, I need help fixing some errors… I have some leaks and segfault but i cant find it…here is my scene.cpp file and headerI’ll also attach the files in RAR in case if you want to run them :)#include “scene.h”using namespace std;Scene::Scene(int max){ image_array = new Image * [max]; //allocate new memory x_coord = new int[max]; y_coord = new int[max];for(int i=0; i<max;i++){image_array[i]=NULL;x_coord[i]=0;y_coord[i]=0;} maximage=max;}Scene::~Scene(){destructor();}Scene::Scene(Scene const & source){copy(source);}void Scene::destructor(){ for(int i=0;i<maximage;i++){ delete image_array[i]; } delete[] image_array; delete [] x_coord; delete [] y_coord;}void Scene::copy(const Scene& source){ //assume image_array is cleared Image ** image_array = new Image*[source.maximage]; int * x_coord = new int[source.maximage]; int * y_coord = new int[source.maximage]; for(int i=0;i<source.maximage;i++){image_array[i]=source.image_array[i];x_coord[i] = source.x_coord[i];y_coord[i] = source.y_coord[i]; }}Scene const & Scene::operator=(Scene const & source){if(this != &source){ //check for self-assignmentdestructor(); //clear memory assoc. with objcopy(source); //make copy}return *this; //return helpful value}void Scene::addpicture(const char* FileName, int index, int x, int y){if(index>maximage-1||index<0){ //check index out of boundscout << “index out of bounds” << endl;return;}//already existsif(image_array[index] != NULL)delete image_array[index];//add pic,x,yimage_array[index]=new Image();image_array[index]->readFromFile(FileName);x_coord[index]=x;y_coord[index]=y;}void Scene::changemaxlayers(int newmax){//check validfor(int i=0; i<maximage; i++){if(image_array[i]!=NULL&i>newmax-1){ cout << “invalid newmax” << endl; return; }}Image ** new_image_array = new Image * [newmax]; for(int i=0;i<maximage&&i<newmax;i++){if(new_image_array[i]!=NULL)delete new_image_array[i];new_image_array[i]=image_array[i]; } //end for;//pass pointer if(newmax>maximage){ for(int i=maximage;i<newmax;i++)image_array[i]=NULL; }maximage=newmax; image_array = new_image_array;for(int i=0;i<newmax;i++){delete new_image_array[i];}delete [] new_image_array;}void Scene::changelayer(int index, int newindex){if(index>-1&&newindex>-1&&newindex!=index&&index<(maximage-1)&&newindex<(maximage-1)&&image_array[index]!=NULL){ if(image_array[newindex] != NULL)delete image_array[newindex]; image_array[newindex]=image_array[index]; //pass pointer image_array[index]=NULL; }elsecout << “invalid index” << endl;}void Scene::translate(int index, int xcoord, int ycoord){if(index>-1&&index<(maximage-1)&&image_array[index]!=NULL){ x_coord[index] = xcoord; y_coord[index] = ycoord; }elsecout << “invalid index” << endl;}void Scene::deletepicture(int index){ if(index>-1&&index<(maximage-1)){delete image_array[index];image_array[index]=NULL; //fix dangling ptr }else cout << “invalid index” << endl;}Image* Scene::getpicture(int index) const{if(index>-1&&index<(maximage-1)){return image_array[index];}elsecout << “invalid index” << endl;return NULL;}Image Scene::drawscene() const{int x=0;int y=0; for(int i=0; i<maximage;i++){if(image_array[i]!=NULL){int max_width = image_array[i]->width() + x_coord[i];int max_height = image_array[i]->height() + y_coord[i];if(max_width>x)x=max_width;if(max_height>y)y=max_height;}//if }//end for//Image* image= Image();Image image;//image->resize(x,y);image.resize(x,y);for(int i=0; i< maximage;i++ ){ if(image_array[i]!=NULL)for(int j=x_coord[i];j<image_array[i]->width()+x_coord[i];j++){for(int k=y_coord[i];k<image_array[i]->height()+y_coord[i];k++){*(image)(j,k)=*(*image_array[i])(j-x_coord[i],k-y_coord[i]); }//k }//j}//i//Image result = (*image);//delete image;return image;}———————————————————-scene.h#ifndef SCENE_H#define SCENE_H#include “image.h”using namespace std;class Scene{public:Scene(int max);Scene(Scene const & source);~Scene();void destructor();void copy(const Scene & source);Scene const & operator =(Scene const & source);void addpicture(const char* FileName, int index, int x, int y);void changemaxlayers(int newmax);void changelayer(int index, int newindex);void translate(int index, int xcoord, int ycoord);void deletepicture(int index);Image* getpicture(int index) const;Image drawscene() const;private:Image ** image_array;Image ** new_image_array;int * x_coord;int * y_coord;int maximage;};#endif

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"