Convolution built-in function
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What are conv function updates as I can't run this code conv(RC,plot(amp)) without error Error: using conv2 Invalid data type. First and second arguments must be numeric or logical., Thing do not happen in version 13 !!
3 个评论
This code
conv(RC,plot(amp))
make very little sense: the function plot returns handles or lines objects. What is the possible meaning of convolution with some numeric vector? What were the output values used for?
abdou sakr
2017-4-19
编辑：abdou sakr
2017-4-19
that is the script and error only for my updated version
John D'Errico
2017-4-19
That would not have worked in any rational way in version 13 either. plot will return a handle to the plot, so totally useless in terms of any convolution.
采纳的回答
What John and Stephen said. What you appear to want (and wanted originally) is just
synthetic=conv(RC,amp);
which would be the convolution of RC and the amp kernel.
Prior to HG2 (handle graphics 2), graphics and other handles were just numeric values (doubles) so arithmetic operations on them were not illegal and so you didn't get an error in earlier release but the answer was nonsensical. Now, handles are a new class and so such erroneous operations can be flagged as errors.
You will want to revisit any calculations done earlier as they are in error; the result would have been just a constant times the vector.
R2012b
>> h=plot(rand(4,1))
h =
174.0016
>> whos h
Name Size Bytes Class Attributes
h 1x1 8 double
>> conv(h,1:4)
ans =
174.0016 348.0032 522.0048 696.0063
>> [1:4]*h
ans =
174.0016 348.0032 522.0048 696.0063
>>
R2014b
>> h=plot(rand(3,1))
>> h
h =
Line with properties:
...
>> whos h
Name Size Bytes Class Attributes
h 1x1 60 matlab.graphics.chart.primitive.Line
>>
>> double(h)
ans =
1.2207e-04
>>
So, you see that prior to HG2 plot returned a double that was a floating point value; the specific value is dependent upon each invocation, but 175+/- is typical. OTOH, with HG2 as R2014b shows, the handle is a class variable and you can't see the numeric value unless you cast it to double and you see the numeric value is grossly different.
Either, way, using the line handle in conv makes no sense computationally, whatsoever.
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