达到最大递归限制500

Question

我尝试运行(adpcm_encoder)时收到以下消息.

??? Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N)
to change the limit. Be aware that exceeding your available stack space can
crash MATLAB and/or your computer.

Error in ==> fileparts

我在许多网站上搜索过这个问题,但我找不到具体的解决方案.

代码是:

function adpcm_y = adpcm_encoder(raw_y)



Y = wavread('two.wav');
Y_en = adpcm_encoder(Y);


IndexTable = [-1, -1, -1, -1, 2, 4, 6, 8, -1, -1, -1, -1, 2, 4, 6, 8];

StepSizeTable = [7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767];

prevsample = 0;
previndex = 1;

Ns = length(raw_y);
n = 1;

raw_y = 32767 * raw_y;          % 16-bit operation

while (n <= Ns)
predsample = prevsample;
index = previndex;
step = StepSizeTable(index);

diff = raw_y(n) - predsample;
if (diff >= 0)
    code = 0;
else
    code = 8;
    diff = -diff;
end

tempstep = step;
if (diff >= tempstep)
    code = bitor(code, 4);
    diff = diff - tempstep;
end
tempstep = bitshift(tempstep, -1);
if (diff >= tempstep)
    code = bitor(code, 2);
    diff = diff - tempstep;
end
tempstep = bitshift(tempstep, -1);
if (diff >= tempstep)
    code = bitor(code, 1);
end

diffq = bitshift(step, -3);
if (bitand(code, 4))
    diffq = diffq + step;
end
if (bitand(code, 2))
    diffq = diffq + bitshift(step, -1);
end
if (bitand(code, 1))
    diffq = diffq + bitshift(step, -2);
end

if (bitand(code, 8))
    predsample = predsample - diffq;
else
    predsample = predsample + diffq;
end

if (predsample > 32767)
    predsample = 32767;
elseif (predsample < -32768)
    predsample = -32768;
end

index = index + IndexTable(code+1);

if (index < 1)
    index = 1;
end
if (index > 89)
    index = 89;
end

prevsample = predsample;
previndex = index;

adpcm_y(n) = bitand(code, 15);
%adpcm_y(n) = code;
n = n + 1;
end

Answer 1

发生这种情况是因为你有一个函数可以递归调用自身而没有停止条件.它是无限循环的递归等价物.

问题是该功能的第二行:

function adpcm_y = adpcm_encoder(raw_y)

    Y = wavread('two.wav');
    Y_en = adpcm_encoder(Y);

函数的第二行递归地再次调用该函数,但由于没有停止条件,它会一直持续到达到最大递归限制错误.