Error: Unexpected MATLAB expression. SYNTAX ERROR?!

2014 6 18
3 个回答
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更新时间：2014 6 18
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0 个投票

>> f=10:1:100000; % f is the frequency varying from 10 to 100000 in steps of 1hz
>> G=2483.71*(2pi*f*10)(2pi*f*100)*1018/(60.7*2pi*f*100)*10-9+1)(6.07*2pi*f*10*10-9+1);
>> faxis=0.000001*f;
>> plot(f axis,f,'w',f,G,'r')
xlabel('Frequency, rad/s'), ylabel('Gain, V/V')
title('Frequency Response Plots')
subplot(2,1,2), semilogx(w, phase)
xlabel('Frequency, rad/s'), ylabel('Phase, deg')
>> xlabel ('Frequency in Hz')
>> ylabel ('Voltage in volts')
>> text (6,6,'G(f)')
G=2483.71*(2pi*f*10)(2pi*f*100)*1018/(60.7*2pi*f*100)*10-9+1)(6.07*2pi*f*10*10-9+1);
|
Error: Unexpected MATLAB expression.
Hey everyone, how are you? I have this code that WAS working not too long ago but when I come to simulate it, it doesn't wanna work and it spits out this error message. This is for a Bode plot Midband voltage amplifier circuit. I have checked my work and everything and it was working before but I don't see what I changed in it. Anyone have any ideas? Thank you :)

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 采纳的回答

Marta Salas
Marta Salas 2014-6-18

1 个投票

You need to checked carefully what you have written in the definition of G, I have spotted some * missing, there is also a missing bracket (bold one) that I can not figure out where it starts:
G=2483.71*(2 * pi*f*10) * (2 * pi*f*100)*1018/(60.7*2 * pi*f*100)*10-9+1 ) *(6.07*2*pi*f*10*10-9+1);

更多回答（2 个）

Image Analyst
Image Analyst 2014-6-18

1 个投票

Why doesn't the G= have a >> in front of it? Is it on the same line as the call to text()? Anyway, that line has for ( but 5 ) so there is a mismatch in the number pf parentheses. Fix that.

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Image Analyst
Image Analyst 2014-6-18
Also, there is a missing operation in between ) and ( in
.....-9+1)(6.07*.......
You can't have two parentheses back to back like that.
Sha Ka
Sha Ka 2014-6-18
Alrighty, I did some editing and I saw that I had a few mistakes and I am still coming across the same problem:
>> f=10:1:100000; % f is the frequency varying from 10 to 100000 in steps of 1hz >> G=2483.71*(2pi*f*10)*((2pi*f*100)*(10^18))/((60.7*2pi*f*100)*(10^-9))+1)*((6.07*2pi*f*10*(10-9))+1); G=2483.71*(2pi*f*10)*((2pi*f*100)*(10^18))/((60.7*2pi*f*100)*(10^-9))+1)*((6.07*2pi*f*10*(10-9))+1); | Error: Unexpected MATLAB expression.
>>
Sha Ka
Sha Ka 2014-6-18
>> G=2483.71*(2*pi*f*10)*((2*pi*f*100)*(10^18))/((60.7*2*pi*f*100)*(10^-9))+1)*((6.07*2*pi*f*10*(10-9))+1); G=2483.71*(2*pi*f*10)*((2*pi*f*100)*(10^18))/((60.7*2*pi*f*100)*(10^-9))+1)*((6.07*2*pi*f*10*(10-9))+1); | Error: Unbalanced or unexpected parenthesis or bracket.
>>
I got the same result :/
Marta Salas
Marta Salas 2014-6-18
编辑：Marta Salas 2014-6-18
You still have a mismatch in in the number of parenthesis. The symbol "|" indicates which braket is unbalanced
Sha Ka
Sha Ka 2014-6-18
Alrighty, I got that error fixed, now I'm getting this:
>> f=10:1:100000; % f is the frequency varying from 10 to 100000 in steps of 1hz G=2483.71*(2*pi*f*10)*((2*pi*f*100)*(10^18))/(((60.7*2*pi*f*100)*(10^-9))+1)*(((6.07*2*pi*f*10)*(10^-9))+1); Error using * Inner matrix dimensions must agree.
What does that mean?
Sha Ka
Sha Ka 2014-6-18
HEY it worked!!! Perfect! Wow thank you so much for all of your help! I appreciate it very much :D
Image Analyst
Image Analyst 2014-6-18
You're welcome. You can "thank" us by voting for our Answers.

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Pallavi
Pallavi 2014-6-18

1 个投票

G=2483.71*(2pi*f*10)(2pi*f*100)*1018/(60.7*2pi*f*100)*10-9+1)(6.07*2pi*f*10*10-9+1);
Please check this expression which says missing parenthesis.
(60.7*2pi*f*100)*10-9+1) is the problem area with no left parenthesis.

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