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Error in => C:\MATLABR11\work\ideal.m On line 4 => v = R*t/p % Ideal gas law Error in => C:\MATLABR11\work\main.m On line 6 => v = ideal(t,p*1e5) Īs you can see, the error is taken from line 6 of the main program, which is related to the reference to the function, and in fact there is an error in line ٤ of the function and specifically “in the division of the two vectors t and p. Now if you run this program, you will receive the following error message: » main Pressure (bar) = Temperature (K) = 300:5:400 ? Error using => / Matrix dimensions must agree. Sub-function (ideal.m): function v = ideal(t,p) R = 8314 % Gas constant (J/kmol.K) v = R*t/p % Ideal gas law
#Does matlab 2018b have stft function code
Suppose you have created the main program and the required function in the first place as follows: Main code (main.m): % Input p = input(‘ Pressure (bar) = ‘) t = input(‘ Temperature (K) = ‘) % Calculation v = ideal(t,p*1e5) % Plotting results surf(p,vol,t) It is best to do the volume calculation in a separate function so that if you want to repeat the calculation with another state equation, you do not need to re-write the original program and just change the volume calculation function. The input data to the program are pressure and temperature ranges, and the program must calculate the specific volume of gas and then plot the surface.
#Does matlab 2018b have stft function how to
This section shows how to correct the program using the received error messages with an example.Ĭonsider that you want to draw the PVT level based on the full gas law. Most of the error messages you receive when you first start working with MATLAB are related to vector / matrix operations and substitutions. Take advantage of debugging features available in the software.Pay attention to what line of the program the error message is given and especially pay attention to what the error message is and what it means.As much as possible, try to use matrix operations and reduce the number of loops that do the same thing in the program.Įxecute the suspicious lines of the program separately in the MATLAB workspace (preferably “with the help of copy-paste) to find out the correctness or incorrectness of the calculation.You can also find out how far the program has progressed by placing disp in certain places in the program. You can do this easily by removing the semicolon ( ) from the end of the calculation statement or writing the name of the variable.
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