Matrix does not compile

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Jon Camilleri 2015-11-21

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评论： Image Analyst 2015-11-21

I am trying to create a bit string, however, this does not compile:

if ((iris_data{1,1} < mean(iris_data{1,1}) r={1,0,0,0};
Error: Unexpected MATLab expression

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Answer 1

James Tursa 2015-11-21

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编辑：James Tursa 2015-11-21

在 MATLAB Online 中打开

Looks like you have unbalanced parentheses. E.g., this would fix that problem:

if iris_data{1,1} < mean(iris_data{1,1})
    r={1,0,0,0};
end

BUT I have to question the logic in this. It looks like you may have a vector expression here:

iris_data{1,1} < mean(iris_data{1,1})

Which would mean the if-test is likely not doing what you really wanted. Can you explain in more detail what you want this if-test to do? What exactly is iris_data{1,1}, and what is r supposed to be?

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Jon Camilleri 2015-11-21

You guessed right, the operation is not what I need.

I wanted to do a bitwise operation, which requires the FixedPoint Designer.

The data should represent statuses i.e. 1 = accepted because it is more than the mean 0 = not accepted because it is not more than the mean

iris_data is a 4x150 matrix represented by numerical data where measurements are taken from flowers.

I am just trying to come up with a machine learning algorithm.

Image Analyst 2015-11-21

Well when they're cells, we call it a "cell array" rather than a matrix, though actually it is a matrix composed of cells. Please, please, please read the FAQ on cells.

So, the upper left cell, iris_data{1,1} -- what is that? Is it a single scalar number? Or is it a vector or a whole matrix? And why are you using cells instead of a much, much simpler numerical array, which, by the way has far less overhead and takes up far less memory?

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