not enough input arguments

Question

aarthy reddy R 2019-9-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478847-not-enough-input-arguments

评论： Guillaume 2019-9-12

function test(num1, num2,small,s)
load (small, num1, num2)
s = sum(num1, num2)
end

this the code for this i'm getting these errors

Not enough input arguments.

Error in test (line 3)

load (small, num1, num2)

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Answer 1

KALYAN ACHARJYA 2019-9-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478847-not-enough-input-arguments#answer_390342

编辑：KALYAN ACHARJYA 2019-9-4

在 MATLAB Online 中打开

I assumed that num1 and num2 are number

function s=test(num1, num2)
s=num1+num2;
end

Save the above function as test.m file name, and pass the inputs arguments form main scripts or command window, like as follows

Command Window:

>> result=test(4,6)
result =
    10

You have to pass the inputs arguments from differnt Matlab scripts to Matlab test.m function file.

see here

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Guillaume 2019-9-4

编辑：Guillaume 2019-9-4

@aarthy, You clearly do not know how to write a function, so learn that first. Kalyan has shown you what the proper syntax for your function probably should be.

The function that you have defined is a function that has 4 inputs and no output. Of those 4 inputs, it only uses the first three and discards the 4th one replacing it by another value calculated inside the function. Since the function has no output, it actually doesn't matter what it does, nothing ever comes out of it.

Now the reason you got the error is that you called the function without passing the required number of inputs. Perhaps you just pressed the run button. The error occured on line 3 as that's where your function first tries to use the missing inputs.

Even if you'd called the function with the required 3 inputs, it still would have errored unless the small input variable contained the path to a valid mat file, and the num1 and num2 variables contained the names of variables within that mat file. But in that case. an error would have occured on the following line since summing variable names (as oppsoed to summing variables) doesn't make sense.

Documentation of the load function.

Guillaume 2019-9-4

在 MATLAB Online 中打开

Note that I've given you the link to the load documentation. I'm not sure what you're trying to do with that load call, but it's certainly not correct.

You are calling load with 3 inputs. If you had a .mat file called myfile.mat containing amongst other things, the variables myvar with value [1, 2, 3] and myothervar with value [4, 5; 6, 7], then the following would work:

small = 'myfile.mat';
num1 = 'myvar';
num2 = 'myothervar';
load(small, num1, num2);
%at this point, two new variables would exist
%myvar = [1, 2, 3]
%myothervar = [4, 5; 6, 7]

You get an error because within the function test, there is no small variable. Perhaps it should be an input to the function? However, if num1 and num2 are numbers as their names imply, your load makes no sense.

Perhaps, you're trying to load the variables called num1 and num2 from a file called small, in which case:

load small.mat num1 num2;   %no ()!
%or
load('small.mat', 'num1', 'num2'); %if using () enclose text in ''

But in that case, there's no point in asking for inputs num1 and num2 since they get immediately overwritten by load.

Note: difference between command and function syntax

aarthy reddy R 2019-9-12

编辑：aarthy reddy R 2019-9-12

在 MATLAB Online 中打开

error question.JPG

i am having error only in line 2 because of load

the error is :Error using load

Unable to read file 's'. No such file or directory.

Error in test (line 2)

load s

but i have imported the s file still dont know ..... please look into the picture i have attached

function out = test(num1, num2)
       load s 
       out = num1 + num2;
end

i want to know how to load an excel sheet so those values can be used in this function

Guillaume 2019-9-12

在 MATLAB Online 中打开

load s

will load the content of a file called s into the workspace of your function. It won't do anything else.

but i have imported the s

I'm not sure what that means exactly. But Whatever you've done outside of the function is irrelevant if you don't pass the stuff as inputs to the function

i want to know how to load an excel sheet so those values can be used in this function

This has absolutely nothing to do with load. You'd use xlsread or preferably readtable to import data from excel, then pass the data as an input to the function.

%data = readtable('C:\somewhere\somefile.xlsx');  %import data from excel as a table
result = test(data.Var1, data.Var2) %call the function passing two columns from the imported data

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