de = ry; %//热源段在z坐标轴上的大 dee = abs(de - js); %//热源段与计算点的轴向距离 Sz = sqrt(r*r + dee * dee); %// r = sqrt(pow((xip - x), 2) + pow((yiq - y), 2));计算点到热源段的距离 d0 = log(lamdpor(1)); d1 = log(lamdpor(2)); d2 = log(lamdpor(3)); d3 = log(lamdpor(4)); if (jjz == 1 && jji == 1) elseif (jjz == 1 && jji == 2) elseif (jjz == 1 && jji == 3) elseif (jjz == 1 && jji == 4) elseif (jjz == 2 && jji == 1) elseif (jjz == 2 && jji == 2) elseif (jjz == 2 && jji == 3) elseif (jjz == 2 && jji == 4) elseif (jjz == 3 && jji == 1) elseif (jjz == 3 && jji == 2) elseif (jjz == 3 && jji == 3) elseif (jjz == 3 && jji == 4) elseif (jjz == 4 && jji == 1) elseif (jjz == 4 && jji == 2) elseif (jjz == 4 && jji == 3) elseif (jjz == 4 && jji == 4) end de = ry; dee = abs(de + js); Sz = sqrt(r*r + dee * dee); d0 = log(lamdpor(1)); d1 = log(lamdpor(2)); d2 = log(lamdpor(3)); d3 = log(lamdpor(4)); if (jjz == 1 && jji == 1) elseif (jjz == 1 && jji == 2) elseif (jjz == 1 && jji == 3) elseif (jjz == 1 && jji == 4) elseif (jjz == 2 && jji == 1) elseif (jjz == 2 && jji == 2) elseif (jjz == 2 && jji == 3) elseif (jjz == 2 && jji == 4) elseif (jjz == 3 && jji == 1) elseif (jjz == 3 && jji == 2) elseif (jjz == 3 && jji == 3) elseif (jjz == 3 && jji == 4) elseif (jjz == 4 && jji == 1) elseif (jjz == 4 && jji == 2) elseif (jjz == 4 && jji == 3) elseif (jjz == 4 && jji == 4) end优化代码

可以将重复的代码提取为函数，将不同的参数作为函数的输入，以减少代码冗余。例如：

function Sz = calculateSz(x, y, z, ry, js, r, lamdpor, jjz, jji)
    de = ry;
    dee = abs(de - js);
    if z < 0
        dee = abs(de + js);
    end
    Sz = sqrt(r*r + dee*dee);

    d = log(lamdpor);
    d0 = d(1);
    d1 = d(2);
    d2 = d(3);
    d3 = d(4);

    if jjz == 1 && jji == 1
        % do something
    elseif jjz == 1 && jji == 2
        % do something
    % ... 省略部分代码
    elseif jjz == 4 && jji == 3
        % do something
    elseif jjz == 4 && jji == 4
        % do something
    end
end

然后在主函数中调用该函数即可，例如：

Sz = calculateSz(x, y, z, ry, js, r, lamdpor, jjz, jji);

相关问题

if (jjz == jji) v = vt(jjz); Rap = apor(jjz); Rlamd = lamdpor(jjz); elseif (jjz == 1 && jji == 2) S1 = Sz * (de - H_layer(1)) / dee; S2 = Sz - S1; s2 = 1 / (S1 + S2); v = vt(jjz); Rlamd = exp((S1*d1+S2*d0)*s2); Rp = (S1 * p(2) + S2 * p(1))*s2; Rc = (S1 * c(2) + S2 * c(1))*s2; Rap = Rlamd / Rp / Rc; elseif (jjz == 1 && jji == 3) S1 = Sz * (de - H_layer(2)) / dee; S2 = Sz * (H_layer(2)- H_layer(1)) / dee; S3 = Sz - S1 - S2; s3 = 1 / (S1 + S2 + S3); v = vt(jjz); Rlamd = exp((S1*d2 + S2 * d1 + S3 * d0)*s3); Rp = (S1 * p(3) + S2 * p(2) + S3 * p(1))*s3; Rc = (S1 * c(3) + S2 * c(2) + S3 * c(1))*s3; Rap = Rlamd / Rp / Rc; end 优化这段代码

可以将这段代码优化为向量化的形式，避免使用逐元素的循环，提高代码效率。具体来说，可以使用逻辑运算符`&`和`|`将三个分支的逻辑条件进行合并，然后使用向量化的方式计算各个变量。代码如下：

cond1 = (jjz == jji);
cond2 = (jjz == 1 & jji == 2);
cond3 = (jjz == 1 & jji == 3);

S1 = cond2 * Sz * (de - H_layer(1)) / dee + cond3 * Sz * (de - H_layer(2)) / dee;
S2 = cond2 * (Sz - S1);
S3 = cond3 * Sz * (H_layer(2) - H_layer(1)) / dee;
S4 = Sz - S1 - S2 - S3;

s = 1 ./ (S1 + S2 + S3 + S4);

v = vt(jjz);
Rlamd = exp((S1*d2 + S2*d1 + S3*d0 + S4*d)*s);

Rp = S1 * p(min(jji+1, 3)) + S2 * p(min(jji, 2)) + S3 * p(1) + S4 * p(1);
Rc = S1 * c(min(jji+1, 3)) + S2 * c(min(jji, 2)) + S3 * c(1) + S4 * c(1);
Rap = Rlamd ./ Rp ./ Rc;

if cond1
    Rap = apor(jjz);
    Rlamd = lamdpor(jjz);
end

这里利用了条件运算符`cond * expr1 + ~cond * expr2`的向量化性质，即当`cond`为真时，返回`expr1`，否则返回`expr2`。另外，我们将`S1`、`S2`、`S3`和`S4`合并为一个向量，并使用点除运算符`./`进行逐元素的除法运算。

希望这个回答能够帮助到您，如果还有任何问题，请随时提出。

de = ry; dee = abs(de - js); Sz = sqrt(r*r + dee * dee); d0 = log(lamdpor(1)); d1 = log(lamdpor(2)); d2 = log(lamdpor(3)); d3 = log(lamdpor(4)); if (jjz == 1 && jji == 1) elseif (jjz == 1 && jji == 2) elseif (jjz == 1 && jji == 3) elseif (jjz == 1 && jji == 4) elseif (jjz == 2 && jji == 1) elseif (jjz == 2 && jji == 2) elseif (jjz == 2 && jji == 3) elseif (jjz == 2 && jji == 4) elseif (jjz == 3 && jji == 1) elseif (jjz == 3 && jji == 2) elseif (jjz == 3 && jji == 3) elseif (jjz == 3 && jji == 4) elseif (jjz == 4 && jji == 1) elseif (jjz == 4 && jji == 2) elseif (jjz == 4 && jji == 3) elseif (jjz == 4 && jji == 4) end de = ry; dee = abs(de + js); Sz = sqrt(r*r + dee * dee); d0 = log(lamdpor(1)); d1 = log(lamdpor(2)); d2 = log(lamdpor(3)); d3 = log(lamdpor(4)); if (jjz == 1 && jji == 1) elseif (jjz == 1 && jji == 2) elseif (jjz == 1 && jji == 3) elseif (jjz == 1 && jji == 4) elseif (jjz == 2 && jji == 1) elseif (jjz == 2 && jji == 2) elseif (jjz == 2 && jji == 3) elseif (jjz == 2 && jji == 4) elseif (jjz == 3 && jji == 1) elseif (jjz == 3 && jji == 2) elseif (jjz == 3 && jji == 3) elseif (jjz == 3 && jji == 4) elseif (jjz == 4 && jji == 1) elseif (jjz == 4 && jji == 2) elseif (jjz == 4 && jji == 3) elseif (jjz == 4 && jji == 4) end

这段代码中有大量的重复代码，并且if-elseif结构也非常冗长。可以将重复的代码提取为函数，将不同的参数作为函数的输入，以减少代码冗余。例如：

function [Sz, d0, d1, d2, d3] = calculateDistanceAndLog(x, y, z, ry, js, r, lamdpor, jjz, jji)
    if z >= 0
        de = ry;
        dee = abs(de - js);
    else
        de = ry;
        dee = abs(de + js);
    end
    Sz = sqrt(r*r + dee*dee);

    d = log(lamdpor);
    d0 = d(1);
    d1 = d(2);
    d2 = d(3);
    d3 = d(4);
end

然后在主函数中调用该函数即可，例如：

[Sz, d0, d1, d2, d3] = calculateDistanceAndLog(x, y, z, ry, js, r, lamdpor, jjz, jji);
if jjz == 1 && jji == 1
    % do something
elseif jjz == 1 && jji == 2
    % do something
% ... 省略部分代码
elseif jjz == 4 && jji == 3
    % do something
elseif jjz == 4 && jji == 4
    % do something
end

这样可以使代码更加简洁易读。