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I need to solve equation in mod .what to do?

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Sakunrat Jaejaima 2015-6-22

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评论： Sakunrat Jaejaima 2015-6-22

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I want to find d from 7*d mod 40 =1.

I need to solve equation in mod.what to do ?

I do

Syms d
Eqn=Mod(1,40)==7*d;
Sold=solve(Eqn,d)

But Answer is

1/7

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回答（2 个）

Torsten 2015-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/224789-i-need-to-solve-equation-in-mod-what-to-do#answer_183522

http://www.mathworks.com/matlabcentral/fileexchange/32856-system-of-linear-congruences/content/lincon.m

Best wishes

Torsten.

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Sakunrat Jaejaima 2015-6-22

Thank you so mush.

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Steven Lord 2015-6-22

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For a system this small? Brute force works fine.

d = 0:39;
d(mod(7*d, 40) == 1)

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Sakunrat Jaejaima 2015-6-22

Thank you so mush.

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