evaluating binary substring to decimal value

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Mohamed Jamal 2020-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/577225-evaluating-binary-substring-to-decimal-value

回答： Image Analyst 2020-8-9

Hi guys, Im implementing a function that gets in its input binary substring of 8bit like this '00000001' and outputs the unsigned integer value of the given input. (output is a variable total, in my example above the retunred value is 1 because 2^0 in binary is '00000001')

I've done in matlab a function like this but it doesn't work well and I get a compilation error and I dont know why:

function unsigned int total=EvaluateBinary(substring)
    byteSize=8;
    char retChar = '\0';
    uint8_t total = 0; %this varibal is unsigned integer of 8bit
    int counter = 1;
    for int i=byteSize:i>0:--i
    if (substring(i-1) == '1') total += counter;
    if (substring(i-1) ~= ' ') counter *= 2;        
    return total;
end

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dpb 2020-8-9

在 MATLAB Online 中打开

function total=EvaluateBinary(substring)  --> function unsigned int total=EvaluateBinary(substring)  
    byteSize=8;
    retChar = '\0';
    uint8_t total = uint8(0); %this varibal is unsigned integer of 8bit
    counter = uint8(1);
    for i=byteSize:-1:1
      if (substring(i-1) == '1'), total += counter; end
      if (substring(i-1) ~= ' '), 
        counter *= 2; 
        return total;
      end  
    end
end    

MATLAB is not C; it is untyped; you cast to a given type, you don't declare a variable as being of a given type.

for and if ... end constructs have MATLAB syntax construction that doesn't identically match C, either.

Read the documentation for basic syntax getting started section.

But, for the particular problem, just use the builtin bin2dec function.

See

doc bin2dec

Mohamed Jamal 2020-8-9

编辑：Mohamed Jamal 2020-8-9

Yes, I just came up from other language of programming (mastering them) and you could say Im newbie in matlab and trying my best.

Appreciated very much

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Answer 1

Image Analyst 2020-8-9

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/577225-evaluating-binary-substring-to-decimal-value#answer_477190

在 MATLAB Online 中打开

Original Question.txt

Mohamed:

That code, which is part C and part MATLAB, would be this in MATLAB:

function total=EvaluateBinary(substring)
byteSize = 8;
retChar = '\0';
total = uint8(0); % This variable is unsigned integer of 8 bit
counter = 1;
for k = byteSize : -1 : 0
	if substring(k-1) == '1'
		total = total + counter;
	end
	if substring(k-1) ~= ' '
		counter = counter * 2;
	end
end