Exclusion of inappropriate inputs in a function

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Left Terry
Left Terry 2022-2-21
评论： DGM 2022-2-22
In the function below the user must enter only numbers. How can I show a screen message if the user enters letters or other unwanted symbols in order to warn him that he entered an inappropriate input?
function [offsets,Nodes,lengths,angles] = grid_syr(x_i,y_i,nex,ney,L1,L2,theta,phi)
if L1 > 0 && L2 > 0 && nex > 0 && ney > 0 && mod(nex,1) == 0 && mod(ney,1) == 0 % Lengths, L1 and L2, must be positive numbers and the number of elements, nex and ney, must be positive and integers.
% Converting degrees to radians
theta = theta*pi/180;
phi = -phi*pi/180;
L2 = L2*sin(theta); % Vertical projection of side L2
x_e = L2*cos(theta); % Extra horizontal length
Nodes = zeros(nex*ney,4); % Initialize elements nodes' matrix
Coordinates = zeros((nex+1)*(ney+1),2); % Initialize nodes coordinates' matrix
% Creating the nodes' matrix
for j = 1:ney
for i = 1:nex
Nodes(i+(j-1)*nex,:) = [(i+(j-1)*(nex+1)) (i+1+(j-1)*(nex+1)) (i+1+j*(nex+1)) (i+j*(nex+1))];
end
end
rot = [cos(phi) -sin(phi);sin(phi) cos(phi)]; % Rotation matrix
% Creating the nodes coordinates' matrix
for j=1:ney+1
for i=1:nex+1
Coordinates((i+(j-1)*(nex+1)),:) = [(x_i+(j-1)*x_e+(i-1)*L1) (y_i+(j-1)*L2)]*rot;
end
end
% Displaying the abovementioned matrices
Nodes
Coordinates
for i=1:size(Nodes,1)
nexss = [(Coordinates(Nodes(i,1),1)) (Coordinates(Nodes(i,2),1)) (Coordinates(Nodes(i,3),1)) (Coordinates(Nodes(i,4),1)) (Coordinates(Nodes(i,1),1))];
neyss = [(Coordinates(Nodes(i,1),2)) (Coordinates(Nodes(i,2),2)) (Coordinates(Nodes(i,3),2)) (Coordinates(Nodes(i,4),2)) (Coordinates(Nodes(i,1),2))];
line(nexss,neyss,'Marker','.','Color','Green')
end
title('Grid')
xlabel('x')
ylabel('y')
for i=1:(nex+1)*(ney+1)
text(Coordinates(i,1),Coordinates(i,2)+L1/20,num2str(i),'FontSize',8); % Displaying the nodes' numbers in the graph
end
for i=1:(nex+1)*(ney+1)
text(Coordinates(i,1), Coordinates(i,2)-L2/40,['(' num2str(Coordinates(i,1)) ',' num2str(Coordinates(i,2)) ')'],'FontSize',8); % Displaying the nodes' coordinates in the graph
end
grid on
end
end

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采纳的回答

Voss
Voss 2022-2-22
function [offsets,Nodes,lengths,angles] = grid_syr(x_i,y_i,nex,ney,L1,L2,theta,phi)
if ~isnumeric(x_i) || ~isnumeric(y_i) ...
|| ~isnumeric(nex) || ~isnumeric(ney) ...
|| ~isnumeric(L1) || ~isnumeric(L2) ...
|| ~isnumeric(theta) || ~isnumeric(phi)
uiwait(errordlg('Non-numeric input!','Error','modal'));
offsets = [];
Nodes = [];
lengths = [];
angles = [];
return
end
% the rest of your function
end
  4 个评论
显示 2更早的评论
Left Terry
Left Terry 2022-2-22
Ok, noted! If I call grid_syr('asdf',0,3,2,3,2,60,0) the function works, but I would like to exclude every case of inappropriate input. I tried ischar() and isstring() but these are not working.
DGM
DGM 2022-2-22
The above does exclude those. It will exclude everything except numeric inputs.

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