'double' input argument not found using a function
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Hello,
I have got a int16 array (called allAudio) and would like to run the function 'findpeaks' on it. When I write pks = findpeaks(allAudio(1,:)), the error message says: "Error using findpeaks (line 59) Input arguments must be 'double'."
I don't understand it... Any thoughts?
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Accepted Answer
Iain
on 22 May 2013
findpeaks only operates on numbers that are 64 bit floating point numbers (they're called doubles).
Convert your 16bit integers to double with the function "double".
double_allAudio = double(allAudio);
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kemo
on 30 Oct 2017
Hello all, But what if we need to specify a certain datatype for the arguments and give the inputs accordingly??
More Answers (1)
Steven Lord
on 30 Oct 2017
In release R2017b we introduced functions islocalmax and islocalmin that support a data input A of double, single, or one of the integer types.
rng default
x = randi(10, 1, 20, 'int8');
ILM = islocalmax(x);
y = [x; ILM]
If you run those four commands, you'll see y is an int8 array and that most of the instances of 10 in x are local maxima, as is one of the instances of 9. To see that graphically:
% NaN values don't get plotted so preallocate then fill the local maxima
z = NaN(size(x));
z(ILM) = x(ILM);
ind = 1:numel(x);
plot(ind, x, '-', ind, z, 'ro');
The red circles correspond to the local maxima. The two plateaus each have one of their two points of equal height marked; see the documentation for islocalmax for more information about how you can customize how that behavior is handled.
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