Question

我是MATLAB的新手，我有以下代码：

a=500;
PI=3.14159265;
radconvert=PI/180;
degconvert=180/PI;

% values at t=9, t=10 and t=11 respectively
alpha=[54.80 54.06 53.34];
beta=[65.59 64.59 63.62];

% converting degrees to radians
for i = 1:3
    alpha(i) = alpha(i)*radconvert;
end

for i = 1:3
    beta(i) = beta(i)*radconvert;
end

% declaring x and y functions
function x(a, alpha, beta)
    (a*tan(beta))/(tan(beta)-tan(alpha));

function y(a, alpha, beta)
    (a*tan(alpha)*tan(beta))/(tan(beta)-tan(alpha));

% doing the calculations
vx1=x(a, alpha(2), beta(2)) - x(a, alpha(1), beta(1));
vy1=y(a, alpha(2), beta(2)) - y(a, alpha(1), beta(1));
vf1=sqrt(vx1^2 + vy1^2);

vx2=x(a, alpha(3), beta(3)) - x(a, alpha(2), beta(2));
vy2=y(a, alpha(3), beta(3)) - y(a, alpha(2), beta(2));
vf2=sqrt(vx2^2 + vy2^2);

vf=(vf1+vf2)/2;
vxavg=(vx1+vx2)/2;
vyavg=(vy1+vy2)/2;

theta = atan(vyavg/vxavg)*degconvert;

% printing the values
sprintf('Velocity at t=10 is: %.2f\n', vf);
sprintf('Climb angle theta is: %.2f\n', theta);

如果我尝试运行它，我会收到以下错误消息：

???错误：文件：code.m行：20列：1函数定义是在这种情况下不允许。

我想我不能在同一个.m文件中声明和使用函数。有人可以帮我解决这个问题吗？

Answer 1

不允许在脚本中定义函数。这是两件不同的事情。您的.m文件是脚本的函数。但可以在MATLAB脚本中定义anonymous functions。由于我不会在这里扩展的范围问题，您的函数参数不应该与主脚本中的变量具有相同的名称。它们的范围相交。如果前一句没有意义，只需确保您的参数名称与您在脚本中调用的内容不同。具有无限功能的代码应如下所示：

a=500;
PI=3.14159265;
radconvert=PI/180;
degconvert=180/PI;

% values at t=9, t=10 and t=11 respectively
alpha=[54.80 54.06 53.34];
beta=[65.59 64.59 63.62];

% converting degrees to radians
for i = 1:3
    alpha(i) = alpha(i)*radconvert;
end

for i = 1:3
    beta(i) = beta(i)*radconvert;
end

% declaring ananymous x and y functions
x = @(mA, mAlpha, mBeta) ...
    (mA*tan(mBeta))/(tan(mBeta)-tan(mAlpha));

y = @(mA, mAlpha, mBeta) ...
    (mA*tan(mAlpha)*tan(mBeta))/(tan(mBeta)-tan(mAlpha));

% doing the calculations
vx1=x(a, alpha(2), beta(2)) - x(a, alpha(1), beta(1));
vy1=y(a, alpha(2), beta(2)) - y(a, alpha(1), beta(1));
vf1=sqrt(vx1^2 + vy1^2);

vx2=x(a, alpha(3), beta(3)) - x(a, alpha(2), beta(2));
vy2=y(a, alpha(3), beta(3)) - y(a, alpha(2), beta(2));
vf2=sqrt(vx2^2 + vy2^2);

vf=(vf1+vf2)/2;
vxavg=(vx1+vx2)/2;
vyavg=(vy1+vy2)/2;

theta = atan(vyavg/vxavg)*degconvert;

% printing the values
msg = sprintf('Velocity at t=10 is: %.2f\n', vf);
disp(msg);
msg = sprintf('Climb angle theta is: %.2f\n', theta);
disp(msg);

我最后还修改了你的打印。

MATLAB中的函数错误

1 个答案: