Cannot call INPUT from EVALC

Question

Lincoln Doney 2020-11-19

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/653753-cannot-call-input-from-evalc

编辑： Dhruti 2024-3-28，15:24

Hey everyone!

I'm working on a MATLAB project which involves user input. The actual project itself all works fine up until I call input(), in which it breaks and continues to run but gives me the error

"Error using input

Cannot call INPUT from EVALC.

t = input('enter a value of t')"

I tried to run the program by just clicking "run" and it works fine, but when I try to publish it it gives me this error. This function used to work in publish mode, too, but it just stopped working at some point.

To test, I made a file called "Test.m" where I just tried an input and printed it:

test = input('input');

display(text)

This worked fine when I pressed run but when I tried to publish it it didn't work and gave the same error. This made me assume that it was something wrong with my publish settings so I tried factory resetting the publish settings and it kept giving me the error (for reference here are my settings)

I've been trying to debug this for a while, but still no avail. I also tried the same code in matlab online, and its the same thing. Does anyone know why this might be?

Thank you!

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Mehri Mehrnia 2022-5-30

"EVALC" errors may relate to bad function name. I'm not optimistic with "Test" name!

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Answer 1

Steven Lord 2020-11-19

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在 MATLAB Online 中打开

You cannot call input from within evalc. I believe this is the expected behavior. evalc would prevent the prompt text from input from displaying, thus giving you no indication that the user was expected to type anything.

I recommend splitting your code into two pieces. The first is the computational function that accepts input arguments as input arguments (not typed in at an input prompt) and can be published (which uses evalc to capture the output to be included in the published document.) The second is an interface script or function that can call input and calls the computational function with inputs entered at the input prompt. You would not try to publish this second piece.

function computationalPiece(k)
x = 0:360;
y = sind(k*x);
plot(x, y)
end

and

function interfacePiece
k = input('Enter the value of k: ');
computationalPiece(k)

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Steven Lord 2020-11-19

Publishing needs to capture whatever your function displays as part of its execution so it can put that into the report being published. The way it does that uses evalc.

Dhruti 2024-3-28，15:24