Problem with displaying zero in a matrix

[crazygrey]

Hi,
I have created a program that multiply matrices, but the problem has to do with not showing 0, instead showing 1.795e-09 or some other smaller numbers.
One of the matrices I get for example :
Matrix=[1.795e-09,-1,0,-2.962e-10,
1,1.795e-09,8.034e-36,0.1]
I don't want the elements to be integers, at least floats (I have defined the contents to be double). But, how do you get rid of this problem?

thanks

[gpraghuram]

Hi,
I have created a program that multiply matrices, but the problem has to do with not showing 0, instead showing 1.795e-09 or some other smaller numbers.
One of the matrices I get for example :
Matrix=[1.795e-09,-1,0,-2.962e-10,
1,1.795e-09,8.034e-36,0.1]
I don't want the elements to be integers, at least floats (I have defined the contents to be double). But, how do you get rid of this problem?

thanks

I think u are using a matrix which stored double values and using a wrong format specifier(like %f instead of %lf ) to print it. I am not sure about the format specifier for double.

Raghuram

[crazygrey]

I haven't specified anything for the double format. If you check the format specifiers here %f is specified for float data.

[weaknessforcats]

I haven't specified anything for the double format. If you check the format specifiers here %f is specified for float data.

The format specifier %f is for a float and %lf is for a double.

You may bee dealing with uninitialized variables. I can't see your code so I am just guessing here.

[crazygrey]

The format specifier %f is for a float and %lf is for a double.

You may bee dealing with uninitialized variables. I can't see your code so I am just guessing here.

The variables are initialized. The elements of the matrix are defined to be "double". As my understanding there are no literals for double number (1.456 for e.g.) but for float (1.456f). Anyways, I tried doing
double sum;
sum=0%lf;
but I ran the code, I got this error (" %lf undeclared identifier ")

[weaknessforcats]

Anyways, I tried doing
double sum;
sum=0%lf;
but I ran the code, I got this error (" %lf undeclared identifier ")

The %lf is a format specifier for functions like printf(), scanf(), etc.

printf("%lf", sum);
 

[crazygrey]

The %lf is a format specifier for functions like printf(), scanf(), etc.

printf("%lf", sum);
 

Brilliant, thanks very much. This definitely solved my problem.