错误使用 sym>convertChar Character vectors and strings in the first argument can only specify a variable or number. To evaluate character vectors and strings representing symbolic expressions, use 'str2sym'. 出错sym>tomupad (第 1608 行) S = convertChar(x); 出错sym (第 400 行) S.s = tom...
I want to do something like this:syms x1 x2 h11 h12 h21 h22 x = [x1 x2] matrix = [h11 h12; h21 h22] And then create my function as:f(x, matrix) = ((2*matrix)^(-1/2))*(x'); But I must be doing something wrong because I get:Error using sym/cat>checkDimensio...
MATLAB教程 第一、二章 MATLAB 入门.doc,第一章 MATLAB 入门 Chapter one: Introduction to MATLAB Matlab(Matrix Laboratory)是美国 MathWorks公司开发的一套高性能的数值分析和计算软件,用于概念设计,算法开发,建模仿真,实时实现的理想的集成环境,是目前最好的科学计算
I created a symbolic function in MATLAB R2021b using this script with the goal of solving an ODE. syms phi(x) lambda L eqn_x = diff(phi,x,2) == -lambda*phi; dphi = diff(phi,x); cond = [phi(0)==0, dphi(1)==0]; % this is the line where the problem starts d...
@Andrew Kraut with symbolic expression you have to be careful of the precision. Even though the default precision should be greater than a double. ThemeCopy digits Digits = 32 There can be some related reasons: Convert symbolic values to MATLAB double prec...
You can substitute a symbolic variable with a numeric value by using the subs function. For example, evaluate the symbolic expression f at the point x = 1/3: syms x f = 2*x^2 - 3*x + 1; subs(f, 1/3) ans = 2/9 The subs function does not change the original expression f: ...
For example, create symx = sym(’x’) Then evaluate and display the symbolic form of the interpolating polynomial with P = polyinterp(x,y,symx) pretty(P) produces -5 (-1/3 x + 1)(-1/2 x + 1)(-x + 1) - 6 (-1/2 x + 3/2)(-x + 2)x -1/2 (-x + 3)(x - 1...
MuPAD (details)MuPAD Language FundamentalsEntering Commands:=Assign variables;Statement sequencesaliasDefines an abbreviation or a macrounaliasDeletes an alias-definitionanamesIdentifiers that have values or propertiesdeleteDelete the value of an identifierfreeIndetsFree indeterminates of an expressiongeniden...
Convert the symbolic expressionrto a MATLAB function with the handleht. The converted function can be used without Symbolic Math Toolbox. syms x y r = sqrt(x^2 + y^2); ht = matlabFunction(r) ht = function_handle with value: @(x,y)sqrt(x.^2+y.^2) ...
How do i get the derivative function for g, which i can then use to evaluate at different points?I tried the symbolic math toolkit, and tried the following:>> syms x >> f = x/sqrt(x^2+1) f = x/(x^2 + 1)^(1/2) >> diff(f) ans = 1/(x^2 + 1)^(1/2) - x^2/(...