how do i write 20logbase10 in matlab

2014 7 8
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更新时间：2014 7 8
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Star Strider
Star Strider 2014-7-8

0 个投票

You just did — almost.
x = 0.5;
dB = 20*log10(x);
produces:
dB =
-6.0206e+000

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seshi reddy
seshi reddy 2014-7-8
Undefined function 'log' for input arguments of type 'uint8'.
Error in signaltonoise (line 17)
20*log(10,a1);
i am getting this error in my code
Image Analyst
Image Analyst 2014-7-8
Cast the badly-named "a1" to a double if that's what it wants.
seshi reddy
seshi reddy 2014-7-8
i did not get you, what do you mean by a double??
seshi reddy
seshi reddy 2014-7-8
looking forward for your reply sir
seshi reddy
seshi reddy 2014-7-8
oh ok thank you so much, but when i was doing in the command window i was getting the answer, can you explain me why is it happening like that. dont mind that if these are stupid questions, i am asking because i am new to this software
Star Strider
Star Strider 2014-7-8
My pleasure!
You should have gotten the same result in your script as with the Command Window if you entered the same commands, unless you somehow implicitly converted a1 to double before you issued your Command Window call to log10. That’s the only way I can explain it.
No questions are stupid questions. No worries.
seshi reddy
seshi reddy 2014-7-8
yeah got it thank you so much

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