rootマクロ又はシェルスクリプト。

#include <TPad.h>
#include <TStyle.h>
#include <TList.h>
#include <TH1.h>
#include <TF1.h>
#include <TGraph.h>
#include <TMultiGraph.h>


void Divide2(TPad* c,Double_t ratio = 0.65){
    //ratio : to set the ratio of upper pad xsize to canvas

    //divide TPad horizontal

    if (!c->IsEditable()) return;
    TVirtualPad* padsav = (TVirtualPad*)gPad;
    c->cd();

    const Char_t* name = c->GetName();

    Double_t defLeftMargin   = gStyle->GetPadLeftMargin();
    Double_t defBottomMargin = gStyle->GetPadBottomMargin();
    Double_t dx = 1.0;

    Double_t x1low = 0;
    Double_t x1up  = x1low + dx;
    Double_t y1up  = 1.0;
    Double_t y1low = y1up - ratio;

    TPad* p1 = new TPad(Form("%s_%d",name,1),Form("%s_%d",name,1),x1low,y1low,x1up,y1up);
    p1->SetLeftMargin(defLeftMargin*ratio);
    p1->SetBottomMargin(0.0);
    p1->SetNumber(1);
    p1->Draw();


    Double_t x2low = 0;
    Double_t x2up  = x1low + dx;
    Double_t y2up  = 1.0 - ratio;
    Double_t y2low = y2up + ratio - 1.0;

    TPad *p2 = new TPad(Form("%s_%d",name,2),Form("%s_%d",name,2),x2low,y2low,x2up,y2up);
    p2->SetTopMargin(0.0);
    p2->SetLeftMargin(defLeftMargin*ratio);
    p2->SetBottomMargin(defBottomMargin/(1.0-ratio));
    p2->SetNumber(2);
    p2->Draw();

    c->Modified();

#ifndef __CINT__
    if (padsav) padsav->cd();
#endif

}

void SetDivideHistStyle(TPad *c,Double_t ratio = 0.65,Double_t lfactor = 1.00,Double_t tfactor = 1.00,Double_t tfactor2 = 1.00,Double_t tfactor3 = 1.00){
    //lfactor : to resize label font on all histograms by lfactor
    //tfactor : to resize title font on all histograms by tfactor
    //tfactor2 : to resize Ytitle font on bottom histograms by tfactor2
    //tfactor3 : to resize Xtitle font by tfactor3

    Double_t defTitleSizex = gStyle->GetTitleSize("x");
    Double_t defLabelSizex = gStyle->GetLabelSize("x");
    Double_t defTitleSizey = gStyle->GetTitleSize("y");
    Double_t defLabelSizey = gStyle->GetLabelSize("y");

    TIter next(c->GetListOfPrimitives());
    TObject* obj;

    int count = 0;
    TPad* p[2];
    while ( (obj = next()) && count < 2) {
        if(obj->InheritsFrom("TPad")){
            p[count] = (TPad*)obj;
            count++;
        }
    }

    if(!(p[0] && p[1])){
        cout << "Error: This pad doesn't have two pads" << endl;
        return;
    }

    TIter next1(p[0]->GetListOfPrimitives());
    TObject* obj1;

    while ((obj1 = next1())) {
        TH1* h = NULL;
        if(obj1->InheritsFrom("TH1")){
            h = (TH1*)obj1;
        }else if(obj1->InheritsFrom("TGraph")){
            h = ((TGraph*)obj1)->GetHistogram();
        }else if(obj1->InheritsFrom("TF1")){
            h = ((TF1*)obj1)->GetHistogram();
        }else if(obj1->InheritsFrom("TMultiGraph")){
            h = ((TMultiGraph*)obj1)->GetHistogram();
        }
        if(h){
            Double_t lsizex  = defLabelSizex/ratio*lfactor;
            Double_t tsizex  = defTitleSizex/ratio*tfactor;
            Double_t lsizey  = defLabelSizey/ratio*lfactor;
            Double_t tsizey  = defTitleSizey/ratio*tfactor;
            Double_t offsety = (0.9*lsizey + 0.3*tsizey) / tsizey;
            Double_t lmargin = 1.5*lsizey + 0.9*tsizey;

            h->SetLabelSize(lsizex,"x");
            h->SetTitleSize(tsizex,"x");
            h->SetLabelSize(lsizey,"y");
            h->SetTitleSize(tsizey,"y");
            h->SetTitleOffset(offsety*ratio,"y");

            if(ratio <= 0.3){
                h->GetYaxis()->SetNdivisions(504);
            }else if(ratio <= 0.4){
                h->GetYaxis()->SetNdivisions(505);
            }else if(0.65 >= ratio){
                h->GetYaxis()->SetNdivisions(509);
            }


            p[0]->SetLeftMargin(lmargin*ratio);
            p[0]->Modified();
        }
    }

    TIter next2(p[1]->GetListOfPrimitives());
    TObject* obj2;

    while ((obj2 = next2())) {
        TH1* h = NULL;
        if(obj2->InheritsFrom("TH1")){
            h = (TH1*)obj2;
        }else if(obj2->InheritsFrom("TGraph")){
            h = ((TGraph*)obj2)->GetHistogram();
        }else if(obj2->InheritsFrom("TF1")){
            h = ((TF1*)obj2)->GetHistogram();
        }else if(obj2->InheritsFrom("TMultiGraph")){
            h = ((TMultiGraph*)obj2)->GetHistogram();

        }
        if(h){

            Double_t lsizex  = defLabelSizex/(1.0-ratio)*lfactor;
            Double_t tsizex  = defTitleSizex/(1.0-ratio)*tfactor*tfactor3;
            Double_t lsizey  = defLabelSizey/(1.0-ratio)*lfactor;
            Double_t tsizey  = defTitleSizey/(1.0-ratio)*tfactor*tfactor2;
            Double_t offsetx = (0.8*lsizex + 0.4*tsizex) / tsizex;
            Double_t offsety = (0.9*lsizey + 0.3*tsizey/tfactor2 ) / tsizey;
            Double_t bmargin = 1.3*lsizex + 1.3*tsizex;
            Double_t lmargin = 1.5*lsizey + 0.9*tsizey/tfactor2;

            h->SetLabelSize(lsizex,"x");
            h->SetTitleSize(tsizex,"x");
            h->SetLabelSize(lsizey,"y");
            h->SetTitleSize(tsizey,"y");
            h->SetTitleOffset(offsetx,"x");
            h->SetTitleOffset(offsety*(1-ratio),"y");

            if(ratio >= 0.65){
                h->GetYaxis()->SetNdivisions(504);
            }else if(ratio >= 0.55){
                h->GetYaxis()->SetNdivisions(505);
            }else if(0.40 <= ratio){
                h->GetYaxis()->SetNdivisions(509);
            }

            p[1]->SetLeftMargin(lmargin*(1.0-ratio));
            p[1]->SetBottomMargin(bmargin);
            p[1]->Modified();

        }

    }

    c->Modified();

}

#include "Divide2.cxx"

void test(){

    TCanvas *c1 = new TCanvas("c1","c1");
    TH1F *h1 = new TH1F("h1",";Xtitle;Ytitle",100,-10,10);
    h1->FillRandom("gaus");
    double x[] = {1,30,80};
    double y[] = {6,30,86};
    TGraph *g = new TGraph(3,x,y);

    Divide2(c1,0.7);//0.7は分割する比率
    c1->cd(1);
    h1->Draw();
    c1->cd(2);
    g->Draw("ap");

    SetDivideHistStyle(c1,0.7);//文字の大きさなどを揃える
}