Calculate Height of a 2D Array of 0's and 1's in C -

-

i'm trying write program finds height of pixels of "image". "image" 2d array of 0's , 1's, 0's being white space, 1's being black pixels.

the nested loop goes through array left right, first through x-axis, y-axis.

i'm trying find highest value of y-value. plan store y values on 0 in new array, , find highest y-value. however, below code has stored y=5 array reason.

i'm thinking order wrong maybe?

#include <stdio.h>  #define max_x       20 #define max_y       20  void printimage(int image[max_x][max_y]); int countblackpixels(int image[max_x][max_y]); int findypixel(int image[max_x][max_y]);  //function prototypes  void processimage(int image[max_x][max_y]) {      int ypixel;     ypixel = findypixel(image);     printf("height: %d\n", ypixel);  }  //height //calculates height of image   int findypixel(int image[max_x][max_y]) {     int x, y, ypixel, i;     int new_array[max_y-1];     x = 0;     ypixel=-1;     while (x < max_x) {         y = max_y-1;         while (y > 0) {             if (image[x][y] == 1) {                 ypixel=y;                 }             y = y - 1;         }         x = x + 1;     }     return ypixel; }

does see i'm going wrong?

this loop assigns all values in array current y value:

for(i=0; < max_y; i++) {     new_array[i] = y;  //store y values in new array }

that's why end 1 value @ end.

you don't need store array of y values. find first non-zero entry in 2d-array, can return current y value answer. (this assumes start searching @ top of image , work way down.)

even if loop bottom up, still don't need array. update ypixel = y; each time encounter non-zero pixel. @ end of loop, ypixel y-value highest non-blank pixel. should start ypixel = -1 or something, helps identify case when whole image blank.


Comments

Post a Comment

Popular posts from this blog

ios - RestKit 0.20 — CoreData: error: Failed to call designated initializer on NSManagedObject class (again) -

-
this error has shown on many times, seems. prominent answer issue seems restkit 0.20 — coredata: error: failed call designated initializer on nsmanagedobject class however, solution posted doesn't work me. let's start beginning: i want upload file server. want parse response make sure uploaded. if not, try again later. model has boolean variable called nsnumber *senttoserver purpose (in coredata, bool saved nsnumber ) . because don't know whether sending going successful, save entity coredata model first before sending via restkit. when post request successful, server returns json string this: {"id":14,"created":true} notice that, of course, id not set on coredata model yet, both id , created new informations model. here's model: @interface recording : nsmanagedobject @property (nonatomic, retain) nsstring * audiofilepath; @property (nonatomic, retain) nsdate * createdat; @property (nonatomic, retain) nsstring * deviceid; @...
Read more

java - Digest auth with Spring Security using javaconfig -

-
so i'm trying create digest authentication spring following documentation trying translate xml "requirements" in java requirements. let's have xml in docs: <bean id="digestfilter" class= "org.springframework.security.web.authentication.www.digestauthenticationfilter"> <property name="userdetailsservice" ref="jdbcdaoimpl"/> <property name="authenticationentrypoint" ref="digestentrypoint"/> <property name="usercache" ref="usercache"/> </bean> <bean id="digestentrypoint" class= "org.springframework.security.web.authentication.www.digestauthenticationentrypoint"> <property name="realmname" value="contacts realm via digest authentication"/> <property name="key" value="acegi"/> <property name="noncevalidityseconds" value="10"/> </b...
Read more

laravel - PDOException in Connector.php line 55: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES) -

-
my .env: app_env=local app_debug=true app_key=myappkey app_url=http://localhost db_connection=mysql db_host=localhost db_port=3306 db_database=gestiontaller db_username=root db_password='root' cache_driver=file session_driver=file queue_driver=sync redis_host=127.0.0.1 redis_password=null redis_port=6379 mail_driver=smtp mail_host=mailtrap.io mail_port=2525 mail_username=null mail_password=null mail_encryption=null i've tried password ", ' , without, restarting server every time. i've tried changing localhost 172.0.0.1. yes, password correct, running mysql -u root -p introducing password root in prompt can go mysql. users table: +------------------+-----------+ | user | host | +------------------+-----------+ | debian-sys-maint | localhost | | mysql.sys | localhost | | root | localhost | | root1 | localhost | +------------------+-----------+ i've added homestead.yaml this: database_port: 3306 ...
Read more