- Convert matr to float using vpa
- Use round function
Error message: Too many input arguments
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Quy Hoang
am 23 Apr. 2022
Beantwortet: Jan
am 23 Apr. 2022
I want to round the results to 4 numbers after the decimal point, but when I run, i get the following error messages like image below:
syms A1 B1 A2 B2 A3 B3 A4 B4
eq1 = A1*log(4)+B1==341;
eq2 = A4*log(10)+B4==0;
eq3 = A1*log(6)+B1==6*A2+B2;
eq4 = 7*A2+B2==A3*(49/2)+B3;
eq5 = 32*A3+B3==A4*log(8)+B4;
eq6 = A1/600-A2/6==0;
eq7 = A2-A3==0;
eq8 = A3/8-A4/8000==0;
eq = [eq1,eq2,eq3,eq4,eq5,eq6,eq7,eq8];
var = [A1, B1, A2, B2, A3, B3, A4, B4];
[A1, B1, A2, B2, A3, B3, A4, B4] = solve(eq, var)
matr = [A1 B1 A2 B2 A3 B3 A4 B4];
result = round(matr,4)
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Akzeptierte Antwort
Alberto Cuadra Lara
am 23 Apr. 2022
Maybe the round function was not compatible with symbolic variables on previous version.
Try this approach:
syms A1 B1 A2 B2 A3 B3 A4 B4
eq1 = A1*log(4)+B1==341;
eq2 = A4*log(10)+B4==0;
eq3 = A1*log(6)+B1==6*A2+B2;
eq4 = 7*A2+B2==A3*(49/2)+B3;
eq5 = 32*A3+B3==A4*log(8)+B4;
eq6 = A1/600-A2/6==0;
eq7 = A2-A3==0;
eq8 = A3/8-A4/8000==0;
eq = [eq1,eq2,eq3,eq4,eq5,eq6,eq7,eq8];
var = [A1, B1, A2, B2, A3, B3, A4, B4];
[A1, B1, A2, B2, A3, B3, A4, B4] = solve(eq, var);
matr = [A1 B1 A2 B2 A3 B3 A4 B4];
result = vpa(matr, 32);
result = round(result, 4)
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Weitere Antworten (2)
Alberto Cuadra Lara
am 23 Apr. 2022
Hi Quy!
What version of MATLAB are you using? Your code works in MATLAB 2021b
syms A1 B1 A2 B2 A3 B3 A4 B4
eq1 = A1*log(4)+B1==341;
eq2 = A4*log(10)+B4==0;
eq3 = A1*log(6)+B1==6*A2+B2;
eq4 = 7*A2+B2==A3*(49/2)+B3;
eq5 = 32*A3+B3==A4*log(8)+B4;
eq6 = A1/600-A2/6==0;
eq7 = A2-A3==0;
eq8 = A3/8-A4/8000==0;
eq = [eq1,eq2,eq3,eq4,eq5,eq6,eq7,eq8];
var = [A1, B1, A2, B2, A3, B3, A4, B4];
[A1, B1, A2, B2, A3, B3, A4, B4] = solve(eq, var);
matr = [A1 B1 A2 B2 A3 B3 A4 B4];
result = round(matr, 4)
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