I find d from 7*d mod 40=1

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Sakunrat Jaejaima
Sakunrat Jaejaima 2015-6-17
评论： Sakunrat Jaejaima 2015-6-18
I find d from 7*d mod 40 =1
syms d
eqn= 7*d==1;
solve(eqn,d,Domain=Dom::IntegerMod(40))
But there error. Help me please.
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Walter Roberson
Walter Roberson 2015-6-18
What is the error message?
Sakunrat Jaejaima
Sakunrat Jaejaima 2015-6-18
I tried the codes but thereis no error shown. Matlab instead asked for/tried to open some matlab files

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回答（1 个）

Walter Roberson
Walter Roberson 2015-6-18
Try
feval(symengine, 'solve', eqn, d, sym('Domain=Dom::IntegerMod(40)'))
Domains are MuPAD objects, and you need to call into MuPAD to use them.

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