清空筛选条件
清空筛选条件

how to solve log log equation??

1 次查看（过去 30 天）
mahmoud abougharara
mahmoud abougharara 2023-12-23
编辑： Torsten 2023-12-23
Ran in:
clc ,clear
syms m
m1=7;
m2=9.41;
t1=273+30;
t2=273+50;
t=40+273
t = 313
b=(log10(log10(m1))-log10(log10(m2)))/((log10(t1)-(log10(t2))));
a=log10(log10(m1))-b*log10(t1);
a
a = -5.5678
b
b = 2.2143
log10(log10(m))=a-b*log10(t);
Error using indexing
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables, and function body must be sym expression.
solve(m)

请先登录，再回答此问题。

回答（1 个）

Sulaymon Eshkabilov
Sulaymon Eshkabilov 2023-12-23
Ran in:
Here is the corrected code (note how the EQN is set up for the given equation):
clc, clearvars
syms m
m1=7;
m2=9.41;
t1=273+30;
t2=273+50;
t=40+273;
b=(log10(log10(m1))-log10(log10(m2)))/((log10(t1)-(log10(t2))));
a=log10(log10(m1))-b*log10(t1);
fprintf('a = %f; b = %f \n', [a, b])
a = -5.567761; b = 2.214304
EQN =log10(log10(m))==a-b*log10(t);
SOL = solve(EQN);
fprintf('Solution: m = %1.16f with solve() \n', double(SOL));
Solution: m = 1.0000000000185594 with solve()

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

产品


版本

R2016b

Community Treasure Hunt

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

Start Hunting!

Translated by