Loop to a specific point in data set

2015 10 13
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更新时间：2015 10 13
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I have a function used to loop through a data set and I want it to stop once the data reaches a specific threshold (In this case, the failure displacement value 'fdValue'. However, I keep getting the error for the if statement:
Undefined function 'ge' for input arguments of type 'cell'.
I think 'cellfun' can be used in this case but I'm not sure how to use it. Any Suggestions? Below is the function
totalRect = 0;
for j = 2:length(bridgeDisp)
%Calculations
rectangle1 = (bridgeDisp(j, 1) - bridgeDisp(j-1, 1))*((bridgeLoad(j, 1) + bridgeLoad(j-1, 1))/2);
totalRect = totalRect + rectangle1;
%If statment error
if bridgeDisp(j, 1) >= fdValue
break;
end
end

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Guillaume
Guillaume 2015-10-13
I think it's clear that fdValue is a cell array since it can't be bridgeDisp (otherwise the error would be on the rectangle1 line).
Why is fdValue a cell array? Can we see how fdValue is created?
Anas Abou Allaban
Anas Abou Allaban 2015-10-13
编辑：Anas Abou Allaban 2015-10-13
Its supposed to be a variable of type double, its an input from a user
Name Size Bytes Class Attributes
fdValue 1x1 118 cell
I just added
fdValue = str2double(fdValue);
in my main function and that let it loop through...I'm guessing thats the solution. Unless you had another suggestion?
Anas Abou Allaban
Anas Abou Allaban 2015-10-13
fdValue = inputdlg('text');
Thats how it was created, I just noticed that inputdlg does not conver to string and that why I added
str2double

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per isakson
per isakson 2015-10-13
编辑：per isakson 2015-10-13

0 个投票

Why is fdValue a cell array in the first place?
I assume the cell array contains a numerical scalar. If so replace
bridgeDisp(j, 1) >= fdValue
by
bridgeDisp(j, 1) >= fdValue{1}
or maybe by
bridgeDisp(j, 1) >= str2double(fdValue{1})
if the cell arrays contains a string

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Anas Abou Allaban
Anas Abou Allaban 2015-10-13
Since fdValue was made like this:
fdValue = inputdlg('text'):
So I added i converted it to double by adding on the next line
fdValue = str2double(fdValue);
and that fixed it
per isakson
per isakson 2015-10-13
编辑：per isakson 2015-10-13
Note that not all functions take a cell array of a string in place of a string, as does str2double. Excerpt of documentation
X = str2double(C) converts the strings in the cell array of strings C to double precision.
However, str2num does not!
>> str2double({'17'})
ans =
17
>> str2num({'17'})
Error using str2num (line 33)
Requires string or character array input.

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