MATLAB: How to add string to the beginning of each element in a string array

elementwisestringstring array

Hi there,

I'm trying to append the string 'Syl_' to the beginning of each element in a string array. For example, if I have the string array

s1 = string(1:4)
Columns 1 through 4
    "1"    "2"    "3"    "4"

I want to attach 'Syl_' to the beginning of each element, yielding:

 Columns 1 through 4
    "Syll_1"    "Syll_2"    "Syll_3"    "Syll_4"

Any help

Best Answer

strcat('Syl_', s1)
ans = 
  1×4 string array
    "Syl_1"    "Syl_2"    "Syl_3"    "Syl_4"

Related Solutions

MATLAB: How to add string to the beginning of each element in a string array

s2 = "Syl_" + s1

MATLAB: Matlab solve indeterminate polynomial equations numerically

Finally, I find out the answer, it seems matlab will do some approximations, the true system is

eqstrue=[ u6*(3*u5 - 1) - u4 - u1 - 3*u2*u3 - 3*u5*u6 + 3*u3*(u2 - 1) + 1/24, u2^2*u3*(u2 - 1) - 2*u5^3*u6 - u2*u3*(u2 - 1)^2 - (2*u4)/27 - u5*u6*(3*u5 - 1)^2 + u5^2*u6*(3*u5 - 1) + 1/360, 1/1260 - 2*u5^4*u6 - 2*u5^2*u6*(3*u5 - 1)^2 - 2*u2^2*u3*(u2 - 1)^2 - (2*u4)/81, u5^2*u6*(3*u5 - 1)^3 - 3*u5^5*u6 - u4/81 - 4*u5^3*u6*(3*u5 - 1)^2 + 4*u5^4*u6*(3*u5 - 1) + 1/2880, 9*u5^4*u6*(3*u5 - 1) - 3*u5^3*u6*(3*u5 - 1)^2 + 1/6720, u5^3*u6*(3*u5 - 1)^3 - 6*u5^4*u6*(3*u5 - 1)^2 - 3*u5^4*u6*(3*u5 - 1)^3 - 6*u5^5*u6*(3*u5 - 1)^2 + 9*u5^5*u6*(3*u5 - 1) - 3*u5^6*u6*(3*u5 - 1) + 1/21600, u5^3*u6*(3*u5 - 1)^3 - 6*u5^4*u6*(3*u5 - 1)^2 + u5^4*u6*(3*u5 - 1)^3 + 2*u5^5*u6*(3*u5 - 1)^2 + 9*u5^5*u6*(3*u5 - 1) + u5^6*u6*(3*u5 - 1) + 11/226800]

after I make

a2 = 1; b2 = -1; b3 = 1;

matlab solves the approximatied system

eqs=[ u6*(3*u5 - 1) - u4 - u1 - 3*u2*u3 - 3*u5*u6 + 3*u3*(u2 - 1) + 1/24, u2^2*u3*(u2 - 1) - 2*u5^3*u6 - u2*u3*(u2 - 1)^2 - (2*u4)/27 - u5*u6*(3*u5 - 1)^2 + u5^2*u6*(3*u5 - 1) + 1/360, 1/1260 - 2*u5^4*u6 - 2*u5^2*u6*(3*u5 - 1)^2 - 2*u2^2*u3*(u2 - 1)^2 - (2*u4)/81, u5^2*u6*(3*u5 - 1)^3 - 3*u5^5*u6 - u4/81 - 4*u5^3*u6*(3*u5 - 1)^2 + 4*u5^4*u6*(3*u5 - 1) + 1/2880, 9*u5^4*u6*(3*u5 - 1) - 3*u5^3*u6*(3*u5 - 1)^2 + 1/6720, u5^3*u6*(3*u5 - 1)^3 - 6*u5^4*u6*(3*u5 - 1)^2 - 3*u5^4*u6*(3*u5 - 1)^3 - 6*u5^5*u6*(3*u5 - 1)^2 + 9*u5^5*u6*(3*u5 - 1) - 3*u5^6*u6*(3*u5 - 1) + 34433922270924495617/743772721051969121157120, u5^3*u6*(3*u5 - 1)^3 - 6*u5^4*u6*(3*u5 - 1)^2 + u5^4*u6*(3*u5 - 1)^3 + 2*u5^5*u6*(3*u5 - 1)^2 + 9*u5^5*u6*(3*u5 - 1) + u5^6*u6*(3*u5 - 1) + 37713343439583972437/743772721051969121157120];

so it gives me an answer, I don't know why it does this. In the last equation.

vpa(11/226800 - 37713343439583972437/743772721051969121157120)
ans = -0.0000022045855379188659798651850341144609

It's a bad approximation.

Best Answer

Related Solutions

MATLAB: How to add string to the beginning of each element in a string array

MATLAB: Matlab solve indeterminate polynomial equations numerically

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