How to fix: Index exceeds the number of array elements (4).

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SITI HASANAH
SITI HASANAH 2020-6-24
回答： Urmila Rajpurohith 2020-6-30
Hello, im write a coding to estimate the specific volume v of steam for the pressure range 0.01 through 10MPa and temperature range 400 degree Celcius through 1000 degree Celius using the ideal gas equation
but i got the error where it said "Index exceed the number of array elements(4) so I confuse about this error
fid = fopen('abc.txt','w');
Vact= [31.06300,40.29600,49.52700,58.75800;
6.209400,8.057700,9.904700,11.75130;
0.306610,0.401110,0.494380,0.587210;
0.073430,0.098860,0.122920,0.146530;
0.039958,0.055665,0.069856,0.083571;
0.026436,0.038378,0.048629,0.058391];
P = [0.01,0.05,1,4,7,10];
T = [673.15,873.15,1073.15,1273.15];
for i=1:6
for j=1:4
vol(i,j) = ((0.000461631).*T(j))./P(i);
end
end
% Calculate %error
for i=1:6
for j=1:4
error(i,j) = 100.0*(vol(i,j)-Vact(i,j))/Vact(i,j);
end
end
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Stephen23
Stephen23 2020-6-25
You definitely should NOT name any variable error, as this shadows the very important inbuilt error function.

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回答（1 个）

Urmila Rajpurohith
Urmila Rajpurohith 2020-6-30
yes,you can replace the variable error with any other variable name;
The best suggestion is not to use inbuilt function names as variable names.
To check if any variable share a name with a built-in function you can use the which function.
For example :
>> error = 2;
>> which -all error
error is a variable.
C:\Program Files\MATLAB\R2020b\toolbox\matlab\connector2\logger\+connector\+internal\Logger.p % Shadowed connector.internal.Logger method
C:\Program Files\MATLAB\R2020b\toolbox\simulink\dependency\analysis\@dependencies\error.p % Shadowed dependencies method
built-in (C:\Program Files\MATLAB\R2020b\toolbox\matlab\lang\error)
% Shadowed
Hope this helps!

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