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How can I write 3 cos² 2x with C?
Assuming x is in radians :
3*pow(cos(2*x),2)
Here is a function for your purpose:
#include <math.h>
double f(double x) {
double c = cos(2 * x);
return c * c * 3;
}
First compute cos 2x, then square the result and multiply by 3.
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Which could be a good method to compute the distance between a cluster and a point to decide if the point can be assigned to the cluster?
I read about Mahalanobis distance that I have implemented in this way:
float mahalanobis(float *cluster, float *point, const float *variance, int d) {
float distance=0;
for (int i = 1; i < d; ++i) {
distance+=pow((point[i] - cluster[i])/variance[i-1], 2);
}
return sqrt(distance);
}
but it seems that the result isn't good. Maybe I'm wrong about the implementation
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Can I make a float number in a C program always round up
You can use the ceil() function. For example:
#include <stdio.h>
#include <math.h>
int main () {
float val1 = 1.6;
printf ("Round up to %.1lf\n", ceil(val1));
return(0);
}
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I'm looking for a way to create a "variable-function" in C language.
In MATLAB i'm able to create something like:
my_function = (#x) sin(x) + x^2 + x;
so that i'm able to evaluate it for any value of 'x' i like:
my_point = 3.09;
my_function(my_point);
is there anything like that for C language?
That's just a regular C function. The terminology would be: "A function with arguments"
double my_function(double x)
{
return sin(x) + x*x + x;
}
#include <stdio.h>
#include<math.h>
#define my_function(x) sin(x) + pow(x,2) + x
int main()
{
double my_point = 3.09;
printf("%lf",my_function(my_point));
return(0);
}
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So I need to calculate the determinant matrix on 2x2 matrix, simple one..
If you can, please write the code, because i don't understand like in the other thread, it's like i'm reading an English Literature + Code..
#include<stdio.h>
int main(){
int x[2][2]={{1,2},{3,4}};
int i,j,d;
for(i=0;i<=1;i++){
for(j=0;j<=1;j++){
printf(" %d ", x[i][j]);
}
printf(" \n");
}
return 0;
}
Thank You!
You don't need a loop to calculate the determinant of a 2x2 matrix, simply use:
int result = (x[0][0] * x[1][1]) - (x[0][1] * x[1][0]);
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I just wonder how to find mean of two numbers without using division.
do not use these conditions :
int mean = (a + b) >> 1;
four fundamental arithmetic operations
I think this may be helpful -->
int a,b,i,j;
if (a>b)
{
int temp = a;
a = b;
b = temp;
}
for(i=a,j=b;i<j;i++,j--)
continue;
if(i==j)printf("%d\n", i);
else printf("%lf\n", (double)(i)-0.5);
Add them then multiply by 0.5 , no division involved.
If they're both integers, you can use a right shift:
int median = (a + b) >> 1;