Firstly, excuse me for insisting so much on this, but I really do not know
what to do.
I use telosb motes and an external sensor and I need to use the natural
logarithmic function in order to convert the adc value of the sensor. I
tried:
#include math.h
...
x=log(y);
but at make I get:
Oops, my bad! Actually logf() works fine. It computes ln correctly. I still
cannot find it in any of the math.h files but it works.
Sorry again.
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I have two different versions of msp430 tools courtesy
of different mystery TOS installations, one in /usr
and one in /opt. They both have the same directory
structure, so the only math.h file I could find was:
.../msp430/msp430/include/math.h
Both contain a logf() declaration, and a
Dear Mr Michael Schippling
Thank you so much for both your help and your irony. I am afraid I was
looking at avr! After your enlightening reply I was able (at last) to find
logf. Unfortunately I cannot understand the base 10 ironic part of your
mail. But logf(2.718) returns 1 so I guess logf
The base10 log ironic part was a reference to how bad
my memory is of math functions that I don't often use...
I also forgot that avr math.h uses doubles...
hope things keep working for you
MS
Geo Gkolfin wrote:
Dear Mr Michael Schippling
Thank you so much for both your help and your irony.
Hello,
I am using a telosb mote and I am trying to convert the adc value of an
external temp sensor in Celsius. The conversion formula uses the logarithmic
function. I need to compute ln(x/y). I tried log(x/y) as in C, but it is not
correct. Could someone help me?
Thanks in advance!
there may be a logf(float) function. Look in the relevant
math.h file to see what's what.
MS
Geo Gkolfin wrote:
Hello,
I am using a telosb mote and I am trying to convert the adc value of an
external temp sensor in Celsius. The conversion formula uses the
logarithmic function. I need to
