怎么在matlab的命令窗口定义 “符号常量”？ MATLAB里面怎么定义符号常量？
Matlab\u5982\u4f55\u5b9a\u4e49\u7b26\u53f7\u53d8\u91cf\u3000\u3000\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\uff0c\u672a\u5b9a\u4e49\u5c31\u4f1a\u51fa\u9519\u3002\u7b26\u53f7\u53d8\u91cf\u5b9a\u4e49\u65b9\u6cd5\u4f8b\u5982: sym x \u6216\u8005 syms x \uff0c\u4e24\u8005\u6709\u533a\u522b\u4e5f\u6709\u5171\u540c\u70b9\u3002
\u5176\u4ed6\u53d8\u91cf\u7684\u5b9a\u4e49\uff1a\u3000\u3000
\u8ba1\u7b97\u8fc7\u7a0b\u5f53\u4e2d\u7684\u5b58\u50a8\u6570\u503c\u7684\u53d8\u91cf
\u3000\u3000\u53ef\u4ee5\u4e0d\u5fc5\u5b9a\u4e49\uff0c\u968f\u65f6\u9700\u8981\uff0c\u968f\u65f6\u5b9a\u4e49\uff0c\u4f46\u662f\u6709\u65f6\u5019\u5982\u679c\u53d8\u91cf\u5f88\u591a\uff0c\u90a3\u4e48\u6700\u597d\u63d0\u524d\u58f0\u660e\uff0c\u58f0\u660e\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u76f4\u63a5\u8d4b\u4e880\u503c\uff0c\u5e76\u4e14\u6ce8\u91ca\uff0c\u8fd9\u6837\u65b9\u4fbf\u4ee5\u540e\u533a\u5206\uff0c\u907f\u514d\u6df7\u6dc6\u3002
\u77e9\u9635\u548c\u5411\u91cf
\u3000\u3000\u5bf9\u4e8e\u77e9\u9635\u4e00\u822c\u90fd\u662f\u9700\u8981\u5b9a\u4e49\u7684\uff0c\u5b9a\u4e49\u597d\u77e9\u9635\u4e4b\u540e\uff0c\u624d\u65b9\u4fbf\u8bbf\u95ee/\u4fee\u6539\u77e9\u9635\u7684\u6307\u5b9a\u5143\u7d20\uff0c\u77e9\u9635\u58f0\u660e\uff08\u5b9a\u4e49\uff09\u7684\u65b9\u6cd5\uff0c\u5e38\u7528\u7684 \u5c31\u662f\u58f0\u660e\u4e3a\u96f6\u77e9\u9635zeros(M,N),\u6216\u8005\u5355\u4f4d\u77e9\u9635ones(M,N),eye(M,N)\u7b49\u3002
\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
计算过程当中的存储数值的变量。可以不必定义，随时需要，随时定义，但是有时候如果变量很多，那么最好提前声明，声明的时候，可以直接赋予0值，并且注释，这样方便以后区分，避免混淆。
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