analyze array in a specific direction - arrays

Question

I have a dynamically allocated array that contains data for a piece of land:
0| 1| 2| 3| 4| 5| ->coordinates
0| 1 0 8 4 1 1
1| 7 4 2 6 7 8
2| 7 4 2 4 3 4
3| 7 1 6 2 0 8
4| 0 0 3 3 6 6
The numbers inside represent height. I have to analyze specific data inside to figure out where i can have suitable jumps(Suitable jumps have 3 squares of reinforcement with an increasing slope of up to 45 degrees,followed by 2 squares steep descending slope -80 degrees).
But the catch is that I only need to analyze the heights that are from the direction from east to west:[1]: https://i.stack.imgur.com/axiNh.png
How can I implement that direction specifically? this is a simplified version of my code so far:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int length=4, width=5;
struct LandData
{
int height;
};
struct LandData* WritingData()
{
struct LandData *arr = (struct LandData*)malloc(length* width* sizeof(struct LandData));
for (int i = 0; i < length ; i++){ //len
for (int j = 0; j < width; j++){//wid
((arr + i*width + j)->height) = rand() % 10;
}
}
int l = 1, h;
float jumps;
for (int i = 0; i < length ; i++) {
for (int j = 0; j < width; j++){
h = ((arr + i*width + j)->height);
jumps = tan(h/l); // cause the angle for the jumps should be 45 deg
if(jumps <= 1)
printf("suitable jumps: %d %d\n", i ,j);
}
}
return(arr);
}
int main()
{
struct LandData *arr = WritingData();
}

Answer 1

as far as I understand, the direction is important for you. if it's, then the following
changing is enough for that.
for (int i = 0; i < length ; i++) {
for (int j = width; j > 0; j--){
h = ((arr + i*width + j)->height);
jumps = tan(h/l); // cause the angle for the jumps should be 45 deg
if(jumps <= 1)
printf("suitable jumps: %d %d\n", i ,j);
}
}