Resolving Matrix dimensions must agree

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Hannah Quirk 2021-5-6

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评论： Hannah Quirk 2021-5-7

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I am creating a unit converter app with app designer and I am having trouble with the following switch statement and getting the error - Matrix dimensions must agree.

The app should select between imperial and Metric conversion, and should swap units via a drop down box.

I tried using a switch case instead of an if/else statement but it also didn't recognise the case parameters.

The problem lies within my 'if' conditions, i.e. if app.DropDown.Value == char('Celsius to Fahrenheit') --- it either says Matrix dimensions must agree or it goes straight to my error message.

How do i get the code to read what units are in the drop down box and then run that code?

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Stephen23 2021-5-6

Note that calling char on a character vector does nothing, it returns exactly the same char vector unchanged.

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Answer 1

Stephen23 2021-5-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/823180-resolving-matrix-dimensions-must-agree#answer_693580

编辑：Stephen23 2021-5-6

在 MATLAB Online 中打开

Use strcmp or strcmpi to check if two text strings match or not:

if strcmp(A,B)

Alternatively you could use one switch statement:

switch app.DropDown.value
    case 'Celcius to Farenheit'
        ..
    case 'etcetera'
        ..
    otherwise
        error('Oh No, I don''t know what to do with this!')
end