0 个投票

The live script is attached, but the code is as follows:
fplot(f,[-1 4])
grid on
title('y=x^3-4*x^2+2*x-4')
xlabel('x');
ylabel('y');
hold on
f(3)-f(5)
Differentiation=diff(y, x)
Integtgral=integral(f,-1,4)
function y=f(x)
y=x^3-4*x^2+2*x-4
end
How do I fix the "not enough input arguments" error and also how do I get the integral to work?

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 采纳的回答

Stephen23
Stephen23 2019-9-20
编辑：Stephen23 2019-9-20

0 个投票

integral(@f,-1,4)
% ^^ the first input needs to be a function handle!
https://www.mathworks.com/help/matlab/function-handles.html

3 个评论
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Adriaan Kruger
Adriaan Kruger 2019-9-20
Than you
but now it oouputs all the values before ploting and give a different error?
please help
y = -4
Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.
y = -11
y = -8.3953
y = -6.4433
y = -5.0735
y = -4.2156
y = -3.7991
y = -3.7536
y = -4.0085
y = -4.4936
y = -5.1383
y = -5.8723
y = -6.6250
y = -7.3261
y = -7.9051
y = -8.2915
y = -8.4150
y = -8.2051
y = -7.5914
y = -6.5034
y = -4.8707
y = -2.6228
y = 0.3106
y = 4
y = -9.7194
y = -7.2965
y = -5.7029
y = -4.5414
y = -3.9336
y = -3.7352
y = -3.8430
y = -4.2552
y = -4.8240
y = -5.5179
y = -6.2472
y = -6.9865
y = -7.6468
y = -8.1422
y = -8.3894
y = -8.3555
y = -7.9529
y = -7.0712
y = -5.7978
y = -3.7725
y = -1.6001
y = 2.0222
y = -10.3411
y = -9.0327
y = -7.8242
y = -6.8529
y = -4.3670
y = -4.0582
y = -3.8569
y = -3.7569
y = -3.7337
y = -3.7901
y = -3.9174
y = -4.1237
y = -7.7810
y = -8.0313
y = -8.2234
y = -8.3489
y = -8.4124
y = -8.3963
y = -8.2922
y = -8.0922
y = -7.7864
y = -7.3490
y = -6.1665
y = -5.3547
y = -4.3434
y = -3.2165
y = -2.1239
y = -0.6803
y = 1.1431
y = 2.9849
y = -4.1327
y = -3.9919
y = -3.8928
y = -3.8257
y = -3.7753
y = -3.7435
y = -3.7317
y = -3.7410
y = -3.7697
y = -3.8145
y = -3.8780
y = -3.9609
y = -8.2591
y = -8.3223
y = -8.3714
y = -8.4034
y = -8.4163
y = -8.4084
y = -8.3787
y = -8.3267
y = -8.2517
y = -8.1519
y = -8.0259
y = -3.8118
y = -3.7866
y = -3.7655
y = -3.7495
y = -3.7387
y = -3.7327
y = -3.7320
y = -3.7367
y = -3.7467
y = -3.7611
y = -3.7794
y = -8.3607
y = -8.3810
y = -8.3970
y = -8.4085
y = -8.4150
y = -8.4163
y = -8.4124
y = -8.4031
y = -8.3883
y = -8.3678
y = -8.3418
y = -8.3102
y = -7
y = 31
ans = -38
Error using sym>funchandle2ref (line 1312)
Only anonymous functions and functions without arguments can be converted to sym.
Error in sym>tomupad (line 1235)
x = funchandle2ref(x);
Error in sym (line 217)
S.s = tomupad(x);
Error in sym/privResolveArgs (line 997)
argout{k} = sym(arg);
Error in sym/diff (line 21)
args = privResolveArgs(S,varargin{:});
y = -11
y = -8.3953
y = -6.4433
y = -5.0735
y = -4.2156
y = -3.7991
y = -3.7536
y = -4.0085
y = -4.4936
y = -5.1383
y = -5.8723
y = -6.6250
y = -7.3261
y = -7.9051
y = -8.2915
y = -8.4150
y = -8.2051
y = -7.5914
y = -6.5034
y = -4.8707
y = -2.6228
y = 0.3106
y = 4
y = -9.7194
y = -7.2965
y = -5.7029
y = -4.5414
y = -3.9336
y = -3.7352
y = -3.8430
y = -4.2552
y = -4.8240
y = -5.5179
y = -6.2472
y = -6.9865
y = -7.6468
y = -8.1422
y = -8.3894
y = -8.3555
y = -7.9529
y = -7.0712
y = -5.7978
y = -3.7725
y = -1.6001
y = 2.0222
y = -6.0561
y = -5.3710
y = -4.7888
y = -4.3670
y = -4.0582
y = -3.8569
y = -3.7569
y = -3.7337
y = -3.7901
y = -3.9174
y = -4.1237
y = -8.0313
y = -8.2234
y = -8.3489
y = -8.4124
y = -8.3963
y = -8.2922
y = -8.0922
y = -7.7864
y = -7.3490
y = -6.8015
y = -4.1327
y = -3.9919
y = -3.8928
y = -3.8257
y = -3.7753
y = -3.7435
y = -3.7317
y = -3.7410
y = -8.4034
y = -8.4163
y = -8.4084
y = -8.3787
y = -8.3267
y = -8.2517
y = -8.1519
y = -8.0259
y = -11
y = -8.3953
y = -6.4433
y = -5.0735
y = -4.2156
y = -3.7991
y = -3.7536
y = -4.0085
y = -4.4936
y = -5.1383
y = -5.8723
y = -6.6250
y = -7.3261
y = -7.9051
y = -8.2915
y = -8.4150
y = -8.2051
y = -7.5914
y = -6.5034
y = -4.8707
y = -2.6228
y = 0.3106
y = 4
y = -9.7194
y = -7.2965
y = -5.7029
y = -4.5414
y = -3.9336
y = -3.7352
y = -3.8430
y = -4.2552
y = -4.8240
y = -5.5179
y = -6.2472
y = -6.9865
y = -7.6468
y = -8.1422
y = -8.3894
y = -8.3555
y = -7.9529
y = -7.0712
y = -5.7978
y = -3.7725
y = -1.6001
y = 2.0222
y = -10.3411
y = -9.0327
y = -7.8242
y = -6.8529
y = -4.3670
y = -4.0582
y = -3.8569
y = -3.7569
y = -3.7337
y = -3.7901
y = -3.9174
y = -4.1237
y = -7.7810
y = -8.0313
y = -8.2234
y = -8.3489
y = -8.4124
y = -8.3963
y = -8.2922
y = -8.0922
y = -7.7864
y = -7.3490
y = -6.1665
y = -5.3547
y = -4.3434
y = -3.2165
y = -2.1239
y = -0.6803
y = 1.1431
y = 2.9849
y = -4.1327
y = -3.9919
y = -3.8928
y = -3.8257
y = -3.7753
y = -3.7435
y = -3.7317
y = -3.7410
y = -3.7697
y = -3.8145
y = -3.8780
y = -3.9609
y = -8.2591
y = -8.3223
y = -8.3714
y = -8.4034
y = -8.4163
y = -8.4084
y = -8.3787
y = -8.3267
y = -8.2517
y = -8.1519
y = -8.0259
y = -3.8118
y = -3.7866
y = -3.7655
y = -3.7495
y = -3.7387
y = -3.7327
y = -3.7320
y = -3.7367
y = -3.7467
y = -3.7611
y = -3.7794
y = -8.3607
y = -8.3810
y = -8.3970
y = -8.4085
y = -8.4150
y = -8.4163
y = -8.4124
y = -8.4031
y = -8.3883
y = -8.3678
y = -8.3418
y = -8.3102
y = -11
y = -8.3953
y = -6.4433
y = -5.0735
y = -4.2156
y = -3.7991
y = -3.7536
y = -4.0085
y = -4.4936
y = -5.1383
y = -5.8723
y = -6.6250
y = -7.3261
y = -7.9051
y = -8.2915
y = -8.4150
y = -8.2051
y = -7.5914
y = -6.5034
y = -4.8707
y = -2.6228
y = 0.3106
y = 4
y = -9.7194
y = -7.2965
y = -5.7029
y = -4.5414
y = -3.9336
y = -3.7352
y = -3.8430
y = -4.2552
y = -4.8240
y = -5.5179
y = -6.2472
y = -6.9865
y = -7.6468
y = -8.1422
y = -8.3894
y = -8.3555
y = -7.9529
y = -7.0712
y = -5.7978
y = -3.7725
y = -1.6001
y = 2.0222
y = -6.0561
y = -5.3710
y = -4.7888
y = -4.3670
y = -4.0582
y = -3.8569
y = -3.7569
y = -3.7337
y = -3.7901
y = -3.9174
y = -4.1237
y = -8.0313
y = -8.2234
y = -8.3489
y = -8.4124
y = -8.3963
y = -8.2922
y = -8.0922
y = -7.7864
y = -7.3490
y = -6.8015
y = -4.1327
y = -3.9919
y = -3.8928
y = -3.8257
y = -3.7753
y = -3.7435
y = -3.7317
y = -3.7410
y = -8.4034
y = -8.4163
y = -8.4084
y = -8.3787
y = -8.3267
y = -8.2517
y = -8.1519
y = -8.0259
Rik
Rik 2019-9-20
The outputs are caused by your omission of a semicolon. If you replace ^ and * by .^ and .* to make sure your function works for array inputs.

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