dlmwrite is printing the wrong number

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Juliette Salexa
Juliette Salexa 2015-1-5
编辑： Star Strider 2015-1-5
dlmwrite('a.txt',288230387962871929,'precision',40);
Creates a file with one number listed:
288230387962871940
I thought this might be due to using a 32-bit version of MATLAB. I then tried with a machine running 64-bit MATLAB, I got:
288230387962871936
Why doesn't it print 288230387962871929 like I asked it to ?

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回答（1 个）

Star Strider
Star Strider 2015-1-5
编辑：Star Strider 2015-1-5
The reason it is writing ‘288230387962871936’ instead of ‘288230387962871929’ is explained by the error the ‘qd’ calculations throws in this code snippet:
qb = dec2bin(288230387962871929);
qd = bin2dec(qb);
Error using bin2dec (line 35)
Binary string must be 52 bits or less.

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