convert negative integer to n (>32) bits?

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Qinghua 2011-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/24373-convert-negative-integer-to-n-32-bits

I need convert negative integer to n (>32) bits binary. I fould 'Integer to Bit Converter' block having limit of number of bits up to 32, and functions 'de2bi' or 'dec2bin' only applicable for non-negtive integer. What can I do? Many thanks!!

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Qinghua 2011-12-20

I have to simulate the output from FPGA which has 43 signed bits and 35 signed bits registers.

Is it possible to program such convertion in Matlab?

Qinghua 2011-12-20

Thanks for advising. I tried:

>> A=de2bi(typecast(int64(-2^41),'uint64'),64,'left-msb');

>> B=A;

>> B(2:22)=[];

By this I can extract the signed 43 bits. But a new problem came when I tried with a smaller negetive integer:

>> de2bi(typecast(int64(-2),'uint64'),64,'left-msb');

It looks the N should be less than -2^16. For practical reason, I need to convert all input data to a same format (INT64). How can I do?

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回答（1 个）

Walter Roberson 2011-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/24373-convert-negative-integer-to-n-32-bits#answer_32042

The Fixed Point Toolbox is probably what you want.

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Fangjun Jiang 2011-12-20

The OP had another question indicating that. But I guess that MATLAB has a Fixed-Point Toolbox too.

Qinghua 2011-12-21

No matter Simulink or Matlab. I can't figure it out by neither of them: Is it possible to convert the nagtive integer e.g. -2199023255552 (-2^41), or -2 to 43 signed bits (or even 64 bits)?

Which functions can I use?

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