Ultrasonic anemometer reading

Using Arduino Programming Questions
17

my goal is to work like this:
if the start of the string = var1 ($IIMWV)

if(strcmp(data, "$IIMWV") == 0)
{
}

write var2(225.0) to somewhere, var3(R) somewhere, etc

data = strtok(NULL, delimiters);
float rVal = atof(data);

data = strtok(NULL, delimiters);
strcpy(var3, data);

I also tried out the atoi function to get the int's out of it

225.0 is not an int. It is a float.

How can I write them away so that I can process it?

That depends on how long you need to persist the values.