matlab里怎么定义某字母为常量？ MATLAB里面怎么定义符号常量？
matlab\u600e\u4e48\u628a\u4e00\u4e2a\u5b57\u6bcd\u5b9a\u4e49\u6210\u5e38\u6570\u6c42\u5bfc\u65f6\u5019\uff0c\u6307\u51fa\u6765\u5bf9\u8c01\u6c42\u5bfc\u5c31\u884c\u4e86\uff0c\u5269\u4e0b\u7684\u4f1a\u81ea\u52a8\u5f53\u505a\u5e38\u91cf\u5904\u7406\uff1a
>> syms w t
>> f=sin(w*t)
f =
sin(w*t)
>> f1=diff(f,'t')
f1 =
cos(w*t)*w
\u4f7f\u7528sym\u51fd\u6570\u5b9a\u4e49\u7b26\u53f7\u53d8\u91cf\u548c\u7b26\u53f7\u8868\u8fbe\u5f0f \uff0c\u5e38\u91cf\u4e0d\u6e05\u695a
\u4e3e\u4e2a\u4f8b\u5b50\uff1a
>> syms x f a
>> a = x + 1;
>> f = 2 * a
f =
2*x + 2
>> subs(f, x, 1)
ans =
4
\u7b26\u53f7\u51fd\u6570\u64cd\u4f5c\uff0c\u7b26\u53f7\u53d8\u91cf\u5b9a\u4e49\uff0c\u7b26\u53f7\u5e38\u91cf\u4f7f\u7528\u4e00\u5e2e\u662fsubs\u7684\u5f62\u5f0f
syms t w
diff(sin(w*t),t)
运行结果为
ans =
w*cos(t*w)
syms t w
diff(sin(w*t),t)
应该是这样写
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