Error using the invoke function,picoscope

Question

Furkan Karaman 2023-3-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1931940-error-using-the-invoke-function-picoscope

回答： Swaraj 2023-4-4

Hello,

I am programming an oscilloscope app in appdesigner for a picoscope(5444D).

If I run an example script whose values are given, it works perfect.

Now I want to use instead of a script a function whose parameters are given by the GUI, if a button is pressed.

By running the function an error appears at the following line:

[status.setChA] = invoke(ps5000aDeviceObj, 'ps5000aSetChannel', ch, 1, type, range, analog_offset);

The invoke function cant be used . The error message says parameters must be scalars, but I checked the variables and all oft hem were scalars. I used the assignin method to let them appear in the workspace and then the isscalar method.

I would be really grateful for any kind of help.

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Answer 1

Swaraj 2023-4-4

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1931940-error-using-the-invoke-function-picoscope#answer_1207974

It is difficult to say until we do not have the variables that you are sending as parameters. You can go through the following documentations to check if you are checking the variable correctly.

One thing you can try is to check that you are not sending Character Array as parameter ('ps5000aSetChannel') as they are considered non-scalers. Try sending a String Instead.

Determine whether input is scalar - MATLAB isscalar (mathworks.com)

Invoke method on COM object or interface, or display methods - MATLAB invoke (mathworks.com)