MATLAB: Error using inline (line 51) Input must be a character vector.

marc florenz arnaldo

Error using inline (line 51) Input must be a character vector.

Best Answer

s = input('Input the function interms of g(x)\n','s') ;

Try using 's' in input, this will convert the entered value into a string. inline needs string. When you have entered 0, it is taken as a number and you are getting error.

Related Solutions

MATLAB: Unable to convert expression containing symbolic variables into double array.

%Problem:
l=1; %endpoint    
T=1; %maximum time 
alpha = 2; %constant 
m=10; 
N=20;
syms f(x) g(x,t)
f(x)=sin(pi*x);
g(x)=(sin(pi*x))*(cos(2*pi*t));
%STEP1
h=l/m;
k=T/N;
lambda=k*alpha/h;
%STEP2
wij = zeros(m,N,'sym');
for j=2:N
    wij(1,j)=0; %wij(0,j)
    wij(m,j)=0;
end
%STEP3
wij(1,1)=f(0); %wij(0,0)
wij(m,1)=f(l); 
%STEP4
for i=2:m-1
    wij(i,1)=subs(f(x),x,(i*h)); %wij(i,0)
    wij(i,2)=(1-lambda^2)*(subs(f(x),x,(i*h)))+(lambda^2/2)*(subs(f(x),x,((i+1)*h)))+(subs(f(x),x,((i-1)*h)))+k*(subs(g(x),x,(i*h)));
end
%STEP5
for j=2:N-1
    for i=2:m-1
        wij(i,j+1)=2*(1-lambda^2)*wij(i,j)+lambda^2*(wij(i+1,j)+wij(i-1,j))-wij(i,j-1);
    end
end
%STEP6
for j=1:N
    t=j*k;
    for i=1:m
        x=i*h;
        fprintf( '%.1f  %.1f  %s\n',x, t, char(vpa(wij(i,j),10)));
    end
end
0.1  0.1  0.0
0.2  0.1  0.5877852523
0.3  0.1  0.8090169944
0.4  0.1  0.9510565163
0.5  0.1  1.0
0.6  0.1  0.9510565163
0.7  0.1  0.8090169944
0.8  0.1  0.5877852523
0.9  0.1  0.3090169944
1.0  0.1  0.0
0.1  0.1  0.0
0.2  0.1  0.02938926261*cos(6.283185307*t) + 0.7135254916
0.3  0.1  0.04045084972*cos(6.283185307*t) + 1.06331351
0.4  0.1  0.04755282581*cos(6.283185307*t) + 1.309016994
0.5  0.1  0.05*cos(6.283185307*t) + 1.426584774
0.6  0.1  0.04755282581*cos(6.283185307*t) + 1.404508497
0.7  0.1  0.04045084972*cos(6.283185307*t) + 1.244949142
0.8  0.1  0.02938926261*cos(6.283185307*t) + 0.9635254916
0.9  0.1  0.01545084972*cos(6.283185307*t) + 0.5877852523
1.0  0.1  0.0
0.1  0.2  0.0
0.2  0.2  0.04045084972*cos(6.283185307*t) + 0.4755282581
0.3  0.2  0.07694208843*cos(6.283185307*t) + 1.213525492
0.4  0.2  0.09045084972*cos(6.283185307*t) + 1.538841769
0.5  0.2  0.09510565163*cos(6.283185307*t) + 1.713525492
0.6  0.2  0.09045084972*cos(6.283185307*t) + 1.720477401
0.7  0.2  0.07694208843*cos(6.283185307*t) + 1.559016994
0.8  0.2  0.05590169944*cos(6.283185307*t) + 1.244949142
0.9  0.2  0.02938926261*cos(6.283185307*t) + 0.6545084972
1.0  0.2  0.0
0.1  0.2  0.0
0.2  0.2  0.04755282581*cos(6.283185307*t) + 0.5
0.3  0.2  0.09045084972*cos(6.283185307*t) + 0.9510565163
0.4  0.2  0.1244949142*cos(6.283185307*t) + 1.618033989
0.5  0.2  0.1309016994*cos(6.283185307*t) + 1.832734395
0.6  0.2  0.1244949142*cos(6.283185307*t) + 1.868033989
0.7  0.2  0.1059016994*cos(6.283185307*t) + 1.720477401
0.8  0.2  0.07694208843*cos(6.283185307*t) + 1.25
0.9  0.2  0.04045084972*cos(6.283185307*t) + 0.6571638901
1.0  0.2  0.0
0.1  0.2  0.0
0.2  0.2  0.05*cos(6.283185307*t) + 0.4755282581
0.3  0.2  0.09510565163*cos(6.283185307*t) + 0.9045084972
0.4  0.2  0.1309016994*cos(6.283185307*t) + 1.244949142
0.5  0.2  0.1538841769*cos(6.283185307*t) + 1.772542486
0.6  0.2  0.1463525492*cos(6.283185307*t) + 1.832734395
0.7  0.2  0.1244949142*cos(6.283185307*t) + 1.559016994
0.8  0.2  0.09045084972*cos(6.283185307*t) + 1.132692148
0.9  0.2  0.04755282581*cos(6.283185307*t) + 0.5954915028
1.0  0.2  0.0
0.1  0.3  0.0
0.2  0.3  0.04755282581*cos(6.283185307*t) + 0.4045084972
0.3  0.3  0.09045084972*cos(6.283185307*t) + 0.7694208843
0.4  0.3  0.1244949142*cos(6.283185307*t) + 1.059016994
0.5  0.3  0.1463525492*cos(6.283185307*t) + 1.244949142
0.6  0.3  0.1538841769*cos(6.283185307*t) + 1.463525492
0.7  0.3  0.1309016994*cos(6.283185307*t) + 1.244949142
0.8  0.3  0.09510565163*cos(6.283185307*t) + 0.9045084972
0.9  0.3  0.05*cos(6.283185307*t) + 0.4755282581
1.0  0.3  0.0
0.1  0.4  0.0
0.2  0.4  0.04045084972*cos(6.283185307*t) + 0.2938926261
0.3  0.4  0.07694208843*cos(6.283185307*t) + 0.5590169944
0.4  0.4  0.1059016994*cos(6.283185307*t) + 0.7694208843
0.5  0.4  0.1244949142*cos(6.283185307*t) + 0.75
0.6  0.4  0.1309016994*cos(6.283185307*t) + 0.6571638901
0.7  0.4  0.1244949142*cos(6.283185307*t) + 0.8090169944
0.8  0.4  0.09045084972*cos(6.283185307*t) + 0.5877852523
0.9  0.4  0.04755282581*cos(6.283185307*t) + 0.3090169944
1.0  0.4  0.0
0.1  0.4  0.0
0.2  0.4  0.02938926261*cos(6.283185307*t) + 0.1545084972
0.3  0.4  0.05590169944*cos(6.283185307*t) + 0.2938926261
0.4  0.4  0.07694208843*cos(6.283185307*t) + 0.25
0.5  0.4  0.09045084972*cos(6.283185307*t) + 0.181635632
0.6  0.4  0.09510565163*cos(6.283185307*t) + 0.09549150281
0.7  0.4  0.09045084972*cos(6.283185307*t)
0.8  0.4  0.07694208843*cos(6.283185307*t) + 0.2135254916
0.9  0.4  0.04045084972*cos(6.283185307*t) + 0.1122569941
1.0  0.4  0.0
0.1  0.5  0.0
0.2  0.5  0.01545084972*cos(6.283185307*t)
0.3  0.5  0.02938926261*cos(6.283185307*t) - 0.1545084972
0.4  0.5  0.04045084972*cos(6.283185307*t) - 0.2938926261
0.5  0.5  0.04755282581*cos(6.283185307*t) - 0.4045084972
0.6  0.5  0.05*cos(6.283185307*t) - 0.4755282581
0.7  0.5  0.04755282581*cos(6.283185307*t) - 0.5
0.8  0.5  0.04045084972*cos(6.283185307*t) - 0.4755282581
0.9  0.5  0.02938926261*cos(6.283185307*t) - 0.09549150281
1.0  0.5  0.0
0.1  0.5  0.0
0.2  0.5  -0.3090169944
0.3  0.5  -0.5877852523
0.4  0.5  -0.8090169944
0.5  0.5  -0.9510565163
0.6  0.5  -1.0
0.7  0.5  -0.9510565163
0.8  0.5  -0.8090169944
0.9  0.5  -0.5877852523
1.0  0.5  0.0
0.1  0.6  0.0
0.2  0.6  - 0.01545084972*cos(6.283185307*t) - 0.5877852523
0.3  0.6  - 0.02938926261*cos(6.283185307*t) - 0.9635254916
0.4  0.6  - 0.04045084972*cos(6.283185307*t) - 1.244949142
0.5  0.6  - 0.04755282581*cos(6.283185307*t) - 1.404508497
0.6  0.6  - 0.05*cos(6.283185307*t) - 1.426584774
0.7  0.6  - 0.04755282581*cos(6.283185307*t) - 1.309016994
0.8  0.6  - 0.04045084972*cos(6.283185307*t) - 1.06331351
0.9  0.6  - 0.02938926261*cos(6.283185307*t) - 0.7135254916
1.0  0.6  0.0
0.1  0.6  0.0
0.2  0.6  - 0.02938926261*cos(6.283185307*t) - 0.6545084972
0.3  0.6  - 0.05590169944*cos(6.283185307*t) - 1.244949142
0.4  0.6  - 0.07694208843*cos(6.283185307*t) - 1.559016994
0.5  0.6  - 0.09045084972*cos(6.283185307*t) - 1.720477401
0.6  0.6  - 0.09510565163*cos(6.283185307*t) - 1.713525492
0.7  0.6  - 0.09045084972*cos(6.283185307*t) - 1.538841769
0.8  0.6  - 0.07694208843*cos(6.283185307*t) - 1.213525492
0.9  0.6  - 0.04045084972*cos(6.283185307*t) - 0.4755282581
1.0  0.6  0.0
0.1  0.7  0.0
0.2  0.7  - 0.04045084972*cos(6.283185307*t) - 0.6571638901
0.3  0.7  - 0.07694208843*cos(6.283185307*t) - 1.25
0.4  0.7  - 0.1059016994*cos(6.283185307*t) - 1.720477401
0.5  0.7  - 0.1244949142*cos(6.283185307*t) - 1.868033989
0.6  0.7  - 0.1309016994*cos(6.283185307*t) - 1.832734395
0.7  0.7  - 0.1244949142*cos(6.283185307*t) - 1.618033989
0.8  0.7  - 0.09045084972*cos(6.283185307*t) - 0.9510565163
0.9  0.7  - 0.04755282581*cos(6.283185307*t) - 0.5
1.0  0.7  0.0
0.1  0.7  0.0
0.2  0.7  - 0.04755282581*cos(6.283185307*t) - 0.5954915028
0.3  0.7  - 0.09045084972*cos(6.283185307*t) - 1.132692148
0.4  0.7  - 0.1244949142*cos(6.283185307*t) - 1.559016994
0.5  0.7  - 0.1463525492*cos(6.283185307*t) - 1.832734395
0.6  0.7  - 0.1538841769*cos(6.283185307*t) - 1.772542486
0.7  0.7  - 0.1309016994*cos(6.283185307*t) - 1.244949142
0.8  0.7  - 0.09510565163*cos(6.283185307*t) - 0.9045084972
0.9  0.7  - 0.05*cos(6.283185307*t) - 0.4755282581
1.0  0.7  0.0
0.1  0.8  0.0
0.2  0.8  - 0.05*cos(6.283185307*t) - 0.4755282581
0.3  0.8  - 0.09510565163*cos(6.283185307*t) - 0.9045084972
0.4  0.8  - 0.1309016994*cos(6.283185307*t) - 1.244949142
0.5  0.8  - 0.1538841769*cos(6.283185307*t) - 1.463525492
0.6  0.8  - 0.1463525492*cos(6.283185307*t) - 1.244949142
0.7  0.8  - 0.1244949142*cos(6.283185307*t) - 1.059016994
0.8  0.8  - 0.09045084972*cos(6.283185307*t) - 0.7694208843
0.9  0.8  - 0.04755282581*cos(6.283185307*t) - 0.4045084972
1.0  0.8  0.0
0.1  0.8  0.0
0.2  0.8  - 0.04755282581*cos(6.283185307*t) - 0.3090169944
0.3  0.8  - 0.09045084972*cos(6.283185307*t) - 0.5877852523
0.4  0.8  - 0.1244949142*cos(6.283185307*t) - 0.8090169944
0.5  0.8  - 0.1309016994*cos(6.283185307*t) - 0.6571638901
0.6  0.8  - 0.1244949142*cos(6.283185307*t) - 0.75
0.7  0.8  - 0.1059016994*cos(6.283185307*t) - 0.7694208843
0.8  0.8  - 0.07694208843*cos(6.283185307*t) - 0.5590169944
0.9  0.8  - 0.04045084972*cos(6.283185307*t) - 0.2938926261
1.0  0.8  0.0
0.1  0.9  0.0
0.2  0.9  - 0.04045084972*cos(6.283185307*t) - 0.1122569941
0.3  0.9  - 0.07694208843*cos(6.283185307*t) - 0.2135254916
0.4  0.9  -0.09045084972*cos(6.283185307*t)
0.5  0.9  - 0.09510565163*cos(6.283185307*t) - 0.09549150281
0.6  0.9  - 0.09045084972*cos(6.283185307*t) - 0.181635632
0.7  0.9  - 0.07694208843*cos(6.283185307*t) - 0.25
0.8  0.9  - 0.05590169944*cos(6.283185307*t) - 0.2938926261
0.9  0.9  - 0.02938926261*cos(6.283185307*t) - 0.1545084972
1.0  0.9  0.0
0.1  0.9  0.0
0.2  0.9  0.09549150281 - 0.02938926261*cos(6.283185307*t)
0.3  0.9  0.4755282581 - 0.04045084972*cos(6.283185307*t)
0.4  0.9  0.5 - 0.04755282581*cos(6.283185307*t)
0.5  0.9  0.4755282581 - 0.05*cos(6.283185307*t)
0.6  0.9  0.4045084972 - 0.04755282581*cos(6.283185307*t)
0.7  0.9  0.2938926261 - 0.04045084972*cos(6.283185307*t)
0.8  0.9  0.1545084972 - 0.02938926261*cos(6.283185307*t)
0.9  0.9  -0.01545084972*cos(6.283185307*t)
1.0  0.9  0.0
0.1  1.0  0.0
0.2  1.0  0.5877852523
0.3  1.0  0.8090169944
0.4  1.0  0.9510565163
0.5  1.0  1.0
0.6  1.0  0.9510565163
0.7  1.0  0.8090169944
0.8  1.0  0.5877852523
0.9  1.0  0.3090169944
1.0  1.0  0.0
0.1  1.0  0.0
0.2  1.0  0.02938926261*cos(6.283185307*t) + 0.7135254916
0.3  1.0  0.04045084972*cos(6.283185307*t) + 1.06331351
0.4  1.0  0.04755282581*cos(6.283185307*t) + 1.309016994
0.5  1.0  0.05*cos(6.283185307*t) + 1.426584774
0.6  1.0  0.04755282581*cos(6.283185307*t) + 1.404508497
0.7  1.0  0.04045084972*cos(6.283185307*t) + 1.244949142
0.8  1.0  0.02938926261*cos(6.283185307*t) + 0.9635254916
0.9  1.0  0.01545084972*cos(6.283185307*t) + 0.5877852523
1.0  1.0  0.0

MATLAB: Answers keep on iterating

Yes, that is what you asked it to do. You display output whenever NORM <= TOL for any given iteration of l, and you iterate l up to N = 100, so you can have up to 100 displays of output.

Presumably something inside your loop is making changes so that the next iteration of l will be working with different inputs, so that the output would be different the next time... otherwise it would be pointless to continue iterating l once the tolerance had been met.

Best Answer

Related Solutions

MATLAB: Unable to convert expression containing symbolic variables into double array.

MATLAB: Answers keep on iterating

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