Error matrix dimensions must agree

Question

Craig Anthony PIllay 2019-9-4

0
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https://ww2.mathworks.cn/matlabcentral/answers/478895-error-matrix-dimensions-must-agree

评论： Craig Anthony PIllay 2019-9-4

I have an issue when running a check of units when a button is pushed.

I have a drown down menu for units and my code should calculate the the actual number depending on what units is selected.

for example if m3/hr is chosen then the fllowrate is divided by 3600 converting to m3/s however if ft3/s is chosen then the flowrate is converted to m3/s

When i run the code intially if i donot change the units there is no error however if i change the drown menu i.e. the units it gives the error.

Matrix dimensions must agree.

I understand the error is because on of my variables is a being treated like a matrix however i am not sure how to fix.

Error occurs on line 5

I have tried to run the code in a value change function however the same problem occurs.

            FlowrateUnitsOne = ['m' char(179) '/hr'];
            FlowrateUnitsTwo = ['ft' char(179) '/hr'];
            FlowrateUnitscheck = app.FlowrateUnits.Value;
            app.FlowrateUnits.ValueChangedFcn;
            if eq(FlowrateUnitscheck,FlowrateUnitsOne)
                Flowrate = app.FlowrateofLiquidEditField.Value/(2.2046*3600);
                app.Label.Text = sprintf('%d',Flowrate);
            elseif eq(FlowrateUnitscheck,FlowrateUnitsTwo)
                Flowrate = app.FlowrateofLiquidEditField.Value/(3600);
                app.Label.Text = sprintf('%d',Flowrate);
            end 