R = subs(S) replaces all occurrences of variables in the symbolic expression S with values obtained from the calling function, or the MATLAB workspace.相当于于用值去替换符号表达式中的变量 例如：The statement y = dsolve('Dy = -a*y')produces y = C2/exp(a*t)Then the statement...
为什么matlab的subs报错？由于subs函数中的内容，其替换变量与被替换变量的要求为sym变量属性，所以，其变量属性不能为double array。分析题主给出的代码，其问题出在多了这条代码t=-5:0.01:5;完善代码，即可正常运行。其执行结果如下。
It seems your solution does return the correct value. However, I lose the symbolic function in the process. Tsymb (the equation is now equal to a value, not an equation). What's the best practice to use subs if I want to continue evaluating the same function for N values of y?
Create a symbolic matrix function f(X,A), keeping the existing definitions of A and X in the workspace. Create the equation. Get syms A [3 3] matrix syms X [3 1] matrix syms f(X,A) [1 1] matrix keepargs eq = diff(diff(f,X),X.') == 2*A eq(X, A) = ∂∂XT ...
matlab subs报错? symst;t=-5:0.01:5;f1=(-t+4).*(u(t)-u(t-4));f2=sin(2*pi*t);f6=f1+f2;g1=subs(f6,t,t-2);ezplot(g1);functionf=u(t)f=0.5+0.5*sign(t);end这是报错内容错误使用sym/subs>normalize(... syms t;t=-5:0.01:5;f1=(-t+4).*(u(t)-u(t-4));f2=sin...
subs的替换就是元素替换，就算是带入矩阵也是执行元素运算，subs程序就是这样写的啊 SUBS Symbolic substitution.SUBS(S) replaces all the variables in the symbolic expression S with values obtained from the calling function, or the MATLAB workspace.SUBS(S,NEW) replaces the free symbolic ...
g = subs(f) replaces symbolic variables in f with their values obtained from the calling function and the MATLAB workspace, and then evaluates f. Variables with no assigned values remain as variables.g = subs(f,old,new,0) prevents switching the arguments old and new if subs(f...
Errorin sym/subs (line 145) G = mupadsubs(F,X,Y); However, if I try to evaluate the expression above without symbolic variables: ThemeCopy ~0 & 0 ans = logical 0 it works perfectly. Any suggestions how to solve this issue?
I have realized that the counts with this function 'subs' doing x(1) +1*x(2) and x(1) + 1*x(2) are differents, for example. The space in these expressions give me results differents.Do not eval() MuPAD expressions, such as are returned by sym() or subs(). MuPAD and MATLAB ...
Iseethat you are using the “subs” function of theSymbolic Math Toolbox from MATLAB. The given substitution of differential expressions in amatrix with other symbols can be achieved by using “subs” and“str2sym”. Here is an example code which shows the process of substitu...