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how to combain matrix with vector
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if I have matrix a = [9 8 7; 6 5 4] and vector v = [1 2 3 4 5] I want to combaine matrix like this
[9 8 7 inf inf; ...
6 5 4 inf inf; ...
1 2 3 4 5]
thank you!!
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Respuestas (3)
KL
el 12 de Dic. de 2017
Editada: KL
el 12 de Dic. de 2017
Something like this?
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
sz = size(a);
a = [a inf(sz(1),size(v,2)-sz(2));v]
4 comentarios
KL
el 12 de Dic. de 2017
Editada: KL
el 12 de Dic. de 2017
I agree with Jan.
@Birdman: Usually when you see a homework, doit4me tag (tagged by volunteers), you could choose not to answer or you could give them some hints rather than explicit answers.
For example the one on the below link was clearly a copy-paste of homework question, a typical doit4me.
Steven Lord
el 12 de Dic. de 2017
And if it sounds like it may be homework but you're not certain, you can gently nudge the poster into offering more information. I tend to use something like "If you show us what you've already tried we may be able to offer some suggestions for how to proceed." to do that nudging.
Andrei Bobrov
el 12 de Dic. de 2017
Editada: Andrei Bobrov
el 12 de Dic. de 2017
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
z = {a;v};
[ii,jj] = cellfun(@size,z);
n = max(jj);
out = cell2mat(arrayfun(@(x,y,k)[z{x},inf(k,n - y)],(1:numel(z))',jj,ii,'un',0))
or
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
z = {a;v};
m = numel(z);
[ii,jj] = cellfun(@size,z);
n = max(jj);
i2 = cumsum(ii);
i1 = i2 - ii + 1;
out = inf(sum(ii),n);
for ii = 1:m
out(i1(ii):i2(ii),1:jj(ii)) = z{ii};
end
1 comentario
Birdman
el 12 de Dic. de 2017
Please do not provide direct solutions before seeing any effort from the user.
Jan
el 12 de Dic. de 2017
Editada: Jan
el 12 de Dic. de 2017
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
out = padcat(a(1, :), a(2, :), v);
out(isnan(out)) = Inf;
Or write a function by your own:
% UNTESTED !!!
function Out = CatPadding(Dim, varargin)
In = varargin;
S1 = cellfun('size', In, 1);
S2 = cellfun('size', In, 2);
c = 1;
if Dim == 1
Out = Inf(sum(S1), max(S2));
for k = 1:numel(In)
Out(c:c+S1(k)-1, 1:S2(k)) = In{k};
c = c + S1(k);
end
elseif Dim == 2
Out = Inf(max(S1), sum(S2));
for k = 1:numel(In)
Out(1:S1(k), c:c+S2(k)-1) = In{k};
c = c + S2(k);
end
else
error('Only Dim=1 and Dim=2 implemented yet.')
end
And:
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
Out = CatPadding(1, a, v)
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