generated "unvaforable zero" value from multiplying two matrices, how to solve/correct it?

3 次查看（过去 30 天）
M Adli Hawariyan
M Adli Hawariyan 2022-7-21
编辑： M Adli Hawariyan 2022-7-21
Ran in:
for simplicity, i have a two matrices A and B generated by matlab like below. when i calculated manually by excel with the function mmult(A;B) the value of C is vaforable like this. even when i increasing the decimal. especially the value of cell matrix C at 3,1 it was definetly zero
but when i multiply them in matlab i got value of C like this
how to deal with this type of problem? any guidance will help me alot, because i got bunch of wild value zero like this :( thanks a lott.
the following attachments is my full code, matrix A is k_sup and matrix B is uaa, and matrix C is Fsupt in my line code. input3Dxlsx is my input.
P.S
i tried calculate separately with new script (like the following A*B bottom), copy those matrices from generated excel (so the value is accurate), and the generated value of matrix C is entirely different, like this:
here is the following matrix A and B i copy from generated excel
A = [-3710000000 0 0 0 0 0;
0 -12624305.56 0 0 0 75745833.33;
0 0 -2318750 0 -13912500 0;
0 0 0 -69358333.33 0 0;
0 0 13912500 0 55650000 0;
0 -75745833.33 0 0 0 302983333.3]
A = 6×6
1.0e+09 * -3.7100 0 0 0 0 0 0 -0.0126 0 0 0 0.0757 0 0 -0.0023 0 -0.0139 0 0 0 0 -0.0694 0 0 0 0 0.0139 0 0.0556 0 0 -0.0757 0 0 0 0.3030
B = [0
0
-0.025876011
0
0.004312668
0]
B = 6×1
0 0 -0.0259 0 0.0043 0
C = A*B
C = 6×1
1.0e+05 * 0 0 0.0000 0 -1.2000 0

请先登录，再回答此问题。

回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by