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I am not a regular Matlab user, so I apologize if this question is naïve. I am working on a hardware project and would like to convert some data to fixed point binary using the fixed point toolbox.

All my data are float in nature and in the range of -1 to +1. I was trying to convert them into fixed point in Matlab, to no avail.

I have been getting different types of errors, from "Cell contents assignment to non cell array objects" to just wrong binary values. Below is my code.

for i=1:count
    temp=datax(i); % datax is a array of decimal values between -1 and 1

    fixeda{i}=bin(sfi(temp,16,15)); 
    % Since all values are in the same range I set the word length to be 16 and fractional part to be 15
end
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up vote 0 down vote

I'm not a matlab user, but shouldn't the 1.15 representation of a float between -1 and 1 just be int(f*32768)

Note that you can only represent numbers less than 1.0 in this representation. 1.0 exactly causes an overflow.

Looking at the help pages it looks like fixeda = bin(sfi(datax,16,15)) should be all you need.

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I am sorry, I didn't understand. Could you explain a bit further. –  user2045143 Nov 5 '13 at 18:01
 
Yes! But since it is an array and I want to save all the binary representations into another array, I am getting "Cell contents assignment to a non-cell array object" error. –  user2045143 Nov 5 '13 at 18:08
 
It doesn't go past the first value. –  user2045143 Nov 5 '13 at 18:08
 
According to the examples, both sfi and bin will take array arguments and return arrays of the same size. Did you declare fixeda as something before attempting to write to it? –  AShelly Nov 5 '13 at 21:37
 
Nope. It seems to work perfect for just 1 value. –  user2045143 Nov 6 '13 at 1:10
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