in this linear matrix. q_1, q_2....the input matrix are 1*11 double. all the F2y,F3x...in the out put are 1*11 double. I want to solve the Sol for each value of input ,output

N = numel()
equ = [0 1 0 -1 0 0 0 0 0 0 0 -1;1 0 -1 0 0 0 0 0 0 0 -1 0;0 0 0 0 0 0 0 1 0 -1 0 1;0 0 0 0 0 0 1 0 -1 0 1 0;0 0 0 0 1 0 -1 0 0 0 0 0;0 0 0 0 0 1 0 -1 0 0 0 0;0 0 1 0 -1 0 0 0 0 0 0 0;0 0 0 1 0 -1 0 0 0 0 0 0;0 0 q_4 q_3 0 0 0 0 0 0 q_2 q_1;0 0 0 0 0 0 q_6 q_5 0 0 q_8 q_7;0 0 0 0 q_10 q_9 0 0 0 0 0 0;0 0 q_12 q_11 0 0 0 0 0 0 0 0]
equ_2 = [F2y;F2x;F3y;F3x;F4x;F4y;F5x;F5y;F6x;F6y;M_1;M_2:M_3;M_4];
Sol = inv(equ)*equ_2;

[Dyuman Joshi]

The first line is incomplete.

If q_1, q_2, ... are 1x11 double, then you can not define equ as a matrix, as dimensions will not match.

Did you mean 1x1 double i.e. scalar values?

[kaixi gu]

yes i know that. But i want the each value of that q_1,q_2 into the matrix to find the coresponding sol for each value of q_1.q_2. so does the F2y...... in equ2. I just have no idea how to do the manipulation

[Dyuman Joshi]

"But i want the each value of that q_1,q_2 into the matrix to find the coresponding sol for each value of q_1.q_2."

I do not understand this statement.

What are the known values? and which variables are unknown, whose values you want to find?

Attach or copy-paste any data you have relevant to this code (use the paperclip button to attach)

[Star Strider]

The ‘equ’ matrix still has the same problem it did when you posted this previously.

All the column lengths in each row have to be equal, however they range from 25 to 32. This will not work until you fix that problem. It has to have a uniform column size that is compatible with whatever else you are using it with.

sequ = '[0 1 0 -1 0 0 0 0 0 0 0 -1;1 0 -1 0 0 0 0 0 0 0 -1 0;0 0 0 0 0 0 0 1 0 -1 0 1;0 0 0 0 0 0 1 0 -1 0 1 0;0 0 0 0 1 0 -1 0 0 0 0 0;0 0 0 0 0 1 0 -1 0 0 0 0;0 0 1 0 -1 0 0 0 0 0 0 0;0 0 0 1 0 -1 0 0 0 0 0 0;0 0 q_4 q_3 0 0 0 0 0 0 q_2 q_1;0 0 0 0 0 0 q_6 q_5 0 0 q_8 q_7;0 0 0 0 q_10 q_9 0 0 0 0 0 0;0 0 q_12 q_11 0 0 0 0 0 0 0 0]';
colends = strfind(sequ,';');

colends = 1×11

27 53 78 103 128 153 178 203 235 267 296

collens = diff([0 colends])

collens = 1×11

27 26 25 25 25 25 25 25 32 32 29

.

[kaixi gu]

yes i know i can not put a 1*11douuble into the matrx. But is there any ways i can use the loop or something to make each value of q and each value of F into the matrix? If I manualy put each value of q and each value of F2y. I would probably need to type the matrix 121 times. I certainly just want each value of q for the corespondinbg each value of F

[Shree Charan]

Could you please explain 'to make each value of q and each value of F into the matrix' and 'I certainly just want each value of q for the corespondinbg each value of F'. It might be useful to provide an example.

Answer 1

[埃博拉酱]

Sol=cell(1,11);
for a=1:11
    Sol{a}=GetOneSol(q_1(a),q_2(a),q_3(a),q_4(a),q_5(a),q_6(a),q_7(a),q_8(a),q_9(a),q_10(a),q_11(a),q_12(a),F2y(a),F2x(a),F3y(a),F3x(a),F4x(a),F4y(a),F5x(a),F5y(a),F6x(a),F6y(a),M_1,M_2,M_3,M_4);
end
function Sol=GetOneSol(q_1,q_2,q_3,q_4,q_5,q_6,q_7,q_8,q_9,q_10,q_11,q_12,F2y,F2x,F3y,F3x,F4x,F4y,F5x,F5y,F6x,F6y,M_1,M_2,M_3,M_4)
equ = [0 1 0 -1 0 0 0 0 0 0 0 -1;1 0 -1 0 0 0 0 0 0 0 -1 0;0 0 0 0 0 0 0 1 0 -1 0 1;0 0 0 0 0 0 1 0 -1 0 1 0;0 0 0 0 1 0 -1 0 0 0 0 0;0 0 0 0 0 1 0 -1 0 0 0 0;0 0 1 0 -1 0 0 0 0 0 0 0;0 0 0 1 0 -1 0 0 0 0 0 0;0 0 q_4 q_3 0 0 0 0 0 0 q_2 q_1;0 0 0 0 0 0 q_6 q_5 0 0 q_8 q_7;0 0 0 0 q_10 q_9 0 0 0 0 0 0;0 0 q_12 q_11 0 0 0 0 0 0 0 0]
equ_2 = [F2y;F2x;F3y;F3x;F4x;F4y;F5x;F5y;F6x;F6y;M_1;M_2:M_3;M_4];
Sol = inv(equ)*equ_2;
end