how do i write 20logbase10 in matlab

log function in matlab

Answer 1

[Star Strider]

You just did — almost.

x = 0.5;
dB = 20*log10(x);

produces:

dB =

      -6.0206e+000

[seshi reddy]

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]

Cast the badly-named "a1" to a double if that's what it wants.

[seshi reddy]

i did not get you, what do you mean by a double??

[seshi reddy]

looking forward for your reply sir

[Star Strider]

ans = 20*log10(double(a1));

[seshi reddy]

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]

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]

yeah got it thank you so much